diff --git a/.github/workflows/getdeps_linux.yml b/.github/workflows/getdeps_linux.yml
index f0d010ba7..230c307c3 100644
--- a/.github/workflows/getdeps_linux.yml
+++ b/.github/workflows/getdeps_linux.yml
@@ -21,112 +21,165 @@ jobs:
     - name: Update system package info
       run: sudo apt-get update
     - name: Install system deps
-      run: sudo python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps --recursive mvfst
-    - name: Install packaging system deps
-      run: sudo python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps --recursive patchelf
+      run: sudo python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps --recursive mvfst && sudo python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps --recursive patchelf
+    - id: paths
+      name: Query paths
+      run: python3 build/fbcode_builder/getdeps.py --allow-system-packages query-paths --recursive --src-dir=. mvfst  >> "$GITHUB_OUTPUT"
     - name: Fetch ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests ninja
     - name: Fetch cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests cmake
     - name: Fetch zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests zlib
     - name: Fetch zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests zstd
     - name: Fetch boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests boost
     - name: Fetch double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests double-conversion
     - name: Fetch fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests fast_float
     - name: Fetch fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests fmt
     - name: Fetch gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests gflags
     - name: Fetch glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests glog
     - name: Fetch googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests googletest
     - name: Fetch libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libdwarf
     - name: Fetch libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libevent
     - name: Fetch lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests lz4
     - name: Fetch snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests snappy
     - name: Fetch openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests openssl
     - name: Fetch liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests liboqs
     - name: Fetch autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests autoconf
     - name: Fetch automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests automake
     - name: Fetch libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libtool
     - name: Fetch libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libsodium
     - name: Fetch libiberty
+      if: ${{ steps.paths.outputs.libiberty_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libiberty
     - name: Fetch libunwind
+      if: ${{ steps.paths.outputs.libunwind_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libunwind
     - name: Fetch xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests xz
     - name: Fetch folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests folly
     - name: Fetch fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests fizz
     - name: Build ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests ninja
     - name: Build cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests cmake
     - name: Build zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests zlib
     - name: Build zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests zstd
     - name: Build boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests boost
     - name: Build double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests double-conversion
     - name: Build fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests fast_float
     - name: Build fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests fmt
     - name: Build gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests gflags
     - name: Build glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests glog
     - name: Build googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests googletest
     - name: Build libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libdwarf
     - name: Build libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libevent
     - name: Build lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests lz4
     - name: Build snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests snappy
     - name: Build openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests openssl
     - name: Build liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests liboqs
     - name: Build autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests autoconf
     - name: Build automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests automake
     - name: Build libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libtool
     - name: Build libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libsodium
     - name: Build libiberty
+      if: ${{ steps.paths.outputs.libiberty_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libiberty
     - name: Build libunwind
+      if: ${{ steps.paths.outputs.libunwind_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libunwind
     - name: Build xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests xz
     - name: Build folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests folly
     - name: Build fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests fizz
     - name: Build mvfst
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --src-dir=. mvfst  --project-install-prefix mvfst:/usr/local
diff --git a/.github/workflows/getdeps_mac.yml b/.github/workflows/getdeps_mac.yml
index a5462f1ad..0a2959192 100644
--- a/.github/workflows/getdeps_mac.yml
+++ b/.github/workflows/getdeps_mac.yml
@@ -20,101 +20,152 @@ jobs:
     - uses: actions/checkout@v4
     - name: Install system deps
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps --recursive mvfst
+    - id: paths
+      name: Query paths
+      run: python3 build/fbcode_builder/getdeps.py --allow-system-packages query-paths --recursive --src-dir=. mvfst  >> "$GITHUB_OUTPUT"
     - name: Fetch ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests ninja
     - name: Fetch cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests cmake
     - name: Fetch zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests zlib
     - name: Fetch zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests zstd
     - name: Fetch boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests boost
     - name: Fetch double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests double-conversion
     - name: Fetch fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests fast_float
     - name: Fetch fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests fmt
     - name: Fetch gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests gflags
     - name: Fetch glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests glog
     - name: Fetch googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests googletest
     - name: Fetch libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libdwarf
     - name: Fetch lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests lz4
     - name: Fetch openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests openssl
     - name: Fetch snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests snappy
     - name: Fetch libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libevent
     - name: Fetch liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests liboqs
     - name: Fetch autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests autoconf
     - name: Fetch automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests automake
     - name: Fetch libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libtool
     - name: Fetch libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests libsodium
     - name: Fetch xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests xz
     - name: Fetch folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests folly
     - name: Fetch fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages fetch --no-tests fizz
     - name: Build ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests ninja
     - name: Build cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests cmake
     - name: Build zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests zlib
     - name: Build zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests zstd
     - name: Build boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests boost
     - name: Build double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests double-conversion
     - name: Build fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests fast_float
     - name: Build fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests fmt
     - name: Build gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests gflags
     - name: Build glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests glog
     - name: Build googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests googletest
     - name: Build libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libdwarf
     - name: Build lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests lz4
     - name: Build openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests openssl
     - name: Build snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests snappy
     - name: Build libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libevent
     - name: Build liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests liboqs
     - name: Build autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests autoconf
     - name: Build automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests automake
     - name: Build libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libtool
     - name: Build libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests libsodium
     - name: Build xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests xz
     - name: Build folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests folly
     - name: Build fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --no-tests fizz
     - name: Build mvfst
       run: python3 build/fbcode_builder/getdeps.py --allow-system-packages build --src-dir=. mvfst  --project-install-prefix mvfst:/usr/local
diff --git a/.github/workflows/getdeps_windows.yml b/.github/workflows/getdeps_windows.yml
index 215e787d2..33b7227fa 100644
--- a/.github/workflows/getdeps_windows.yml
+++ b/.github/workflows/getdeps_windows.yml
@@ -21,97 +21,147 @@ jobs:
       run: "echo BOOST_ROOT=%BOOST_ROOT_1_83_0% >> %GITHUB_ENV%"
       shell: cmd
     - name: Fix Git config
-      run: git config --system core.longpaths true
-    - name: Disable autocrlf
-      run: git config --system core.autocrlf false
+      run: >
+        git config --system core.longpaths true &&
+        git config --system core.autocrlf false &&
+        git config --system core.symlinks true
+      shell: cmd
     - uses: actions/checkout@v4
+    - id: paths
+      name: Query paths
+      run: python build/fbcode_builder/getdeps.py query-paths --recursive --src-dir=. mvfst  >> $env:GITHUB_OUTPUT
+      shell: pwsh
     - name: Fetch ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests ninja
     - name: Fetch cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests cmake
     - name: Fetch libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests libsodium
     - name: Fetch zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests zlib
     - name: Fetch zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests zstd
     - name: Fetch boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests boost
     - name: Fetch double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests double-conversion
     - name: Fetch fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests fast_float
     - name: Fetch fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests fmt
     - name: Fetch gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests gflags
     - name: Fetch glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests glog
     - name: Fetch googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests googletest
     - name: Fetch libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests libdwarf
     - name: Fetch lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests lz4
     - name: Fetch snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests snappy
     - name: Fetch jom
+      if: ${{ steps.paths.outputs.jom_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests jom
     - name: Fetch perl
+      if: ${{ steps.paths.outputs.perl_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests perl
     - name: Fetch openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests openssl
     - name: Fetch libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests libevent
     - name: Fetch folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests folly
     - name: Fetch liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests liboqs
     - name: Fetch fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python build/fbcode_builder/getdeps.py fetch --no-tests fizz
     - name: Build ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests ninja
     - name: Build cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests cmake
     - name: Build libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests libsodium
     - name: Build zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests zlib
     - name: Build zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests zstd
     - name: Build boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests boost
     - name: Build double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests double-conversion
     - name: Build fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests fast_float
     - name: Build fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests fmt
     - name: Build gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests gflags
     - name: Build glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests glog
     - name: Build googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests googletest
     - name: Build libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests libdwarf
     - name: Build lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests lz4
     - name: Build snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests snappy
     - name: Build jom
+      if: ${{ steps.paths.outputs.jom_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests jom
     - name: Build perl
+      if: ${{ steps.paths.outputs.perl_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests perl
     - name: Build openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests openssl
     - name: Build libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests libevent
     - name: Build folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests folly
     - name: Build liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests liboqs
     - name: Build fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python build/fbcode_builder/getdeps.py build --no-tests fizz
     - name: Build mvfst
       run: python build/fbcode_builder/getdeps.py build --src-dir=. mvfst 
diff --git a/build/fbcode_builder/getdeps.py b/build/fbcode_builder/getdeps.py
index 03a5f3c04..138e729e7 100755
--- a/build/fbcode_builder/getdeps.py
+++ b/build/fbcode_builder/getdeps.py
@@ -552,6 +552,33 @@ def setup_project_cmd_parser(self, parser):
         )
 
 
+@cmd("query-paths", "print the paths for tooling to use")
+class QueryPathsCmd(ProjectCmdBase):
+    def run_project_cmd(self, args, loader, manifest):
+        if args.recursive:
+            manifests = loader.manifests_in_dependency_order()
+        else:
+            manifests = [manifest]
+
+        for m in manifests:
+            fetcher = loader.create_fetcher(m)
+            if isinstance(fetcher, SystemPackageFetcher):
+                # We are guaranteed that if the fetcher is set to
+                # SystemPackageFetcher then this item is completely
+                # satisfied by the appropriate system packages
+                continue
+            src_dir = fetcher.get_src_dir()
+            print(f"{m.name}_SOURCE={src_dir}")
+
+    def setup_project_cmd_parser(self, parser):
+        parser.add_argument(
+            "--recursive",
+            help="print the transitive deps also",
+            action="store_true",
+            default=False,
+        )
+
+
 @cmd("show-source-dir", "print the source dir for a given project")
 class ShowSourceDirCmd(ProjectCmdBase):
     def run_project_cmd(self, args, loader, manifest):
@@ -1001,6 +1028,10 @@ def write_job_for_platform(self, platform, args):  # noqa: C901
             manifest_ctx.set("test", "on")
         run_on = self.get_run_on(args)
 
+        tests_arg = "--no-tests "
+        if run_tests:
+            tests_arg = ""
+
         # Some projects don't do anything "useful" as a leaf project, only
         # as a dep for a leaf project. Check for those here; we don't want
         # to waste the effort scheduling them on CI.
@@ -1086,12 +1117,14 @@ def write_job_for_platform(self, platform, args):  # noqa: C901
                 )
                 out.write("      shell: cmd\n")
 
-                # The git installation may not like long filenames, so tell it
-                # that we want it to use them!
                 out.write("    - name: Fix Git config\n")
-                out.write("      run: git config --system core.longpaths true\n")
-                out.write("    - name: Disable autocrlf\n")
-                out.write("      run: git config --system core.autocrlf false\n")
+                out.write("      run: >\n")
+                out.write("        git config --system core.longpaths true &&\n")
+                out.write("        git config --system core.autocrlf false &&\n")
+                # cxx crate needs symlinks enabled
+                out.write("        git config --system core.symlinks true\n")
+                # && is not supported on default windows powershell, so use cmd
+                out.write("      shell: cmd\n")
 
             out.write("    - uses: actions/checkout@v4\n")
 
@@ -1127,17 +1160,12 @@ def write_job_for_platform(self, platform, args):  # noqa: C901
                 if build_opts.is_darwin():
                     # brew is installed as regular user
                     sudo_arg = ""
-                tests_arg = "--no-tests "
-                if run_tests:
-                    tests_arg = ""
-                out.write(
-                    f"      run: {sudo_arg}python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps {tests_arg}--recursive {manifest.name}\n"
-                )
+
+                system_deps_cmd = f"{sudo_arg}{getdepscmd}{allow_sys_arg} install-system-deps {tests_arg}--recursive {manifest.name}"
                 if build_opts.is_linux() or build_opts.is_freebsd():
-                    out.write("    - name: Install packaging system deps\n")
-                    out.write(
-                        f"      run: {sudo_arg}python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps {tests_arg}--recursive patchelf\n"
-                    )
+                    system_deps_cmd += f" && {sudo_arg}{getdepscmd}{allow_sys_arg} install-system-deps {tests_arg}--recursive patchelf"
+                out.write(f"      run: {system_deps_cmd}\n")
+
                 required_locales = manifest.get(
                     "github.actions", "required_locales", ctx=manifest_ctx
                 )
@@ -1152,6 +1180,18 @@ def write_job_for_platform(self, platform, args):  # noqa: C901
                         out.write(f"    - name: Ensure {loc} locale present\n")
                         out.write(f"      run: {sudo_arg}locale-gen {loc}\n")
 
+            out.write("    - id: paths\n")
+            out.write("      name: Query paths\n")
+            if build_opts.is_windows():
+                out.write(
+                    f"      run: {getdepscmd}{allow_sys_arg} query-paths {tests_arg}--recursive --src-dir=. {manifest.name}  >> $env:GITHUB_OUTPUT\n"
+                )
+                out.write("      shell: pwsh\n")
+            else:
+                out.write(
+                    f'      run: {getdepscmd}{allow_sys_arg} query-paths {tests_arg}--recursive --src-dir=. {manifest.name}  >> "$GITHUB_OUTPUT"\n'
+                )
+
             projects = loader.manifests_in_dependency_order()
 
             main_repo_url = manifest.get_repo_url(manifest_ctx)
@@ -1178,25 +1218,32 @@ def write_job_for_platform(self, platform, args):  # noqa: C901
                 ctx = loader.ctx_gen.get_context(m.name)
                 if m.get_repo_url(ctx) != main_repo_url:
                     out.write("    - name: Fetch %s\n" % m.name)
+                    out.write(
+                        f"      if: ${{{{ steps.paths.outputs.{m.name}_SOURCE }}}}\n"
+                    )
                     out.write(
                         f"      run: {getdepscmd}{allow_sys_arg} fetch --no-tests {m.name}\n"
                     )
 
             for m in projects:
-                if m != manifest:
-                    if m.name == "rust":
-                        continue
-                    else:
-                        src_dir_arg = ""
-                        ctx = loader.ctx_gen.get_context(m.name)
-                        if main_repo_url and m.get_repo_url(ctx) == main_repo_url:
-                            # Its in the same repo, so src-dir is also .
-                            src_dir_arg = "--src-dir=. "
-                            has_same_repo_dep = True
-                        out.write("    - name: Build %s\n" % m.name)
-                        out.write(
-                            f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{src_dir_arg}{free_up_disk}--no-tests {m.name}\n"
-                        )
+                if m == manifest or m.name == "rust":
+                    continue
+                src_dir_arg = ""
+                ctx = loader.ctx_gen.get_context(m.name)
+                if main_repo_url and m.get_repo_url(ctx) == main_repo_url:
+                    # Its in the same repo, so src-dir is also .
+                    src_dir_arg = "--src-dir=. "
+                    has_same_repo_dep = True
+
+                out.write("    - name: Build %s\n" % m.name)
+                if not src_dir_arg:
+                    # only run the step if needed
+                    out.write(
+                        f"      if: ${{{{ steps.paths.outputs.{m.name}_SOURCE }}}}\n"
+                    )
+                out.write(
+                    f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{src_dir_arg}{free_up_disk}--no-tests {m.name}\n"
+                )
 
             out.write("    - name: Build %s\n" % manifest.name)
 
@@ -1213,12 +1260,8 @@ def write_job_for_platform(self, platform, args):  # noqa: C901
             if has_same_repo_dep:
                 no_deps_arg = "--no-deps "
 
-            no_tests_arg = ""
-            if not run_tests:
-                no_tests_arg = "--no-tests "
-
             out.write(
-                f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{no_tests_arg}{no_deps_arg}--src-dir=. {manifest.name} {project_prefix}\n"
+                f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{tests_arg}{no_deps_arg}--src-dir=. {manifest.name} {project_prefix}\n"
             )
 
             out.write("    - name: Copy artifacts\n")
diff --git a/build/fbcode_builder/getdeps/fetcher.py b/build/fbcode_builder/getdeps/fetcher.py
index c769c118d..a1737089b 100644
--- a/build/fbcode_builder/getdeps/fetcher.py
+++ b/build/fbcode_builder/getdeps/fetcher.py
@@ -244,7 +244,9 @@ def __init__(self, build_options, manifest, repo_url, rev, depth) -> None:
                     if not m:
                         raise Exception("Failed to parse rev from %s" % hash_file)
                     rev = m.group(1)
-                    print("Using pinned rev %s for %s" % (rev, repo_url))
+                    print(
+                        "Using pinned rev %s for %s" % (rev, repo_url), file=sys.stderr
+                    )
 
         self.rev = rev or "main"
         self.origin_repo = repo_url