--- config.tests/unix/compile.test.orig
+++ config.tests/unix/compile.test
@@ -13,7 +13,7 @@
 shift 7
 LFLAGS="$SYSROOT_FLAG"
 INCLUDEPATH=""
-CXXFLAGS="$SYSROOT_FLAG"
+CXXFLAGS="$CXXFLAGS $SYSROOT_FLAG"
 MAC_ARCH_CXXFLAGS=""
 MAC_ARCH_LFLAGS=""
 while [ "$#" -gt 0 ]; do