--- config.tests/unix/compile.test.orig	2016-05-12 13:16:04.782542000 +0200
+++ config.tests/unix/compile.test	2016-05-12 13:16:17.510837000 +0200
@@ -14,7 +14,7 @@
 LFLAGS="$SYSROOT_FLAG"
 INCLUDEPATH=""
 CFLAGS="$SYSROOT_FLAG"
-CXXFLAGS="$SYSROOT_FLAG"
+CXXFLAGS="$CXXFLAGS $SYSROOT_FLAG"
 MAC_ARCH_CXXFLAGS=""
 MAC_ARCH_LFLAGS=""
 while [ "$#" -gt 0 ]; do