Use -isystem instead of -I for the staging incdir.
This will make the staging directory to be the
last one in the include chain, this should make all
'local' includes be handled first and only then we will
fall back to the staging directory.
nice option...
# Build flags and options.
##################################################################
-export BUILD_CPPFLAGS = "-I${STAGING_DIR}/${BUILD_SYS}/include"
+export BUILD_CPPFLAGS = "-isystem${STAGING_DIR}/${BUILD_SYS}/include"
export CPPFLAGS = "${TARGET_CPPFLAGS}"
-export TARGET_CPPFLAGS = "-I${STAGING_DIR}/${TARGET_SYS}/include"
+export TARGET_CPPFLAGS = "-isystem${STAGING_DIR}/${TARGET_SYS}/include"
export BUILD_CFLAGS = "${BUILD_CPPFLAGS} ${BUILD_OPTIMIZATION}"
export CFLAGS = "${TARGET_CFLAGS}"