diff --git a/mswindows/osgeo4w/build_osgeo4w.sh b/mswindows/osgeo4w/build_osgeo4w.sh
index cc1e4bc781..cc344b5b5a 100755
--- a/mswindows/osgeo4w/build_osgeo4w.sh
+++ b/mswindows/osgeo4w/build_osgeo4w.sh
@@ -20,7 +20,8 @@ export PATH=${OSGEO4W_ROOT_MSYS}/bin:/usr/bin:/mingw64/bin
 export C_INCLUDE_PATH=".:${OSGEO4W_ROOT_MSYS}/include:${SRC}/dist.${ARCH}/include:/d/msys64/mingw64/include"
 export PYTHONHOME=${OSGEO4W_ROOT_MSYS}/apps/Python312
 export ARCH=x86_64-w64-mingw32
-export PKG_CONFIG_PATH=${PKG_CONFIG_PATH}:/d/msys64/mingw64/lib/pkgconfig
+export PKG_CONFIG_PATH=${PKG_CONFIG_PATH}
+# :/d/msys64/mingw64/lib/pkgconfig
 echo "PKG_CONFIG_PATH: ${PKG_CONFIG_PATH}"
 echo
 A=$(cygpath -w /mingw64/lib/pkgconfig)
@@ -29,6 +30,7 @@ echo
 cygpath -u $A
 echo
 pkg-config --libs pdal
+pkg-config --cflags pdal
 pkg-config --libs /d/msys64/mingw64/lib/pkgconfig/pdal.pc
 pkg-config --libs /mingw64/lib/pkgconfig/pdal.pc
 echo