fix: build nghttp2 from source on macOS for wheel compatibility

- Remove Homebrew nghttp2 dependency on macOS to avoid deployment target conflicts
- Build nghttp2 from source for better macOS version compatibility
- Add --ignore-missing-dependencies to delocate-wheel for static linking
- This allows wheels to work on older macOS versions (11.0+) instead of requiring 15.0+

The issue was that Homebrew's libnghttp2 is compiled for macOS 15.0+, causing
delocate-wheel to fail when building wheels for macOS 11.0. By building from
source, we can target older macOS versions.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: arman-bd

pyproject.toml

@@ -131,9 +131,10 @@ before-build = "bash scripts/setup_vendors.sh"
 
 [tool.cibuildwheel.macos]
 before-all = [
-    "brew install cmake ninja openssl@3 libnghttp2 go",
+    "brew install cmake ninja go",
 ]
 before-build = "bash scripts/setup_vendors.sh"
+repair-wheel-command = "delocate-wheel --require-archs {delocate_archs} -w {dest_dir} {wheel} --ignore-missing-dependencies"
 
 [tool.cibuildwheel.windows]
 before-all = [

scripts/setup_vendors.sh

@@ -163,12 +163,8 @@ fi
 echo ""
 echo "==> Setting up nghttp2..."
 
-# On macOS, use Homebrew's nghttp2 if available
-if [ "$OS" = "Darwin" ] && command -v brew &> /dev/null && brew list libnghttp2 &> /dev/null; then
-    echo "✓ Using Homebrew's libnghttp2"
-    echo "  Location: $(brew --prefix libnghttp2)"
 # On Windows with vcpkg, use vcpkg's nghttp2
-elif [ "$OS" = "Windows" ] && [ -n "$VCPKG_ROOT" ] && [ -d "$VCPKG_ROOT/installed/x64-windows" ]; then
+if [ "$OS" = "Windows" ] && [ -n "$VCPKG_ROOT" ] && [ -d "$VCPKG_ROOT/installed/x64-windows" ]; then
     echo "✓ Using vcpkg's nghttp2"
     echo "  Location: $VCPKG_ROOT/installed/x64-windows"
 # On Windows with MSYS2, use the MSYS2 package
@@ -238,9 +234,7 @@ echo "  ✓ BoringSSL:  $VENDOR_DIR/boringssl/build"
 if [ "$OS" = "Linux" ]; then
     echo "  ✓ liburing:   $VENDOR_DIR/liburing/install"
 fi
-if [ "$OS" = "Darwin" ] && command -v brew &> /dev/null && brew list libnghttp2 &> /dev/null; then
-    echo "  ✓ nghttp2:    $(brew --prefix libnghttp2) (Homebrew)"
-elif [ "$OS" = "Windows" ] && [ -n "$VCPKG_ROOT" ] && [ -d "$VCPKG_ROOT/installed/x64-windows" ]; then
+if [ "$OS" = "Windows" ] && [ -n "$VCPKG_ROOT" ] && [ -d "$VCPKG_ROOT/installed/x64-windows" ]; then
     echo "  ✓ nghttp2:    $VCPKG_ROOT/installed/x64-windows (vcpkg)"
 elif [ "$OS" = "Windows" ] && [ -d "/mingw64/include/nghttp2" ]; then
     echo "  ✓ nghttp2:    /mingw64 (MSYS2)"