--- old/common/autoconf/build-performance.m4	2014-02-13 22:21:01.660336851 +0100
+++ new/common/autoconf/build-performance.m4	2014-02-13 22:21:01.560336289 +0100
@@ -261,7 +261,7 @@
 
   if test "x$ENABLE_PRECOMPH" = xyes; then
     # Check that the compiler actually supports precomp headers.
-    if test "x$GCC" = xyes; then
+    if test "x$TOOLCHAIN_TYPE" = xgcc; then
       AC_MSG_CHECKING([that precompiled headers work])
       echo "int alfa();" > conftest.h
       $CXX -x c++-header conftest.h -o conftest.hpp.gch 2>&AS_MESSAGE_LOG_FD >&AS_MESSAGE_LOG_FD