--- a/common/autoconf/build-performance.m4	Tue Oct 11 09:49:31 2016 +0200
+++ b/common/autoconf/build-performance.m4	Wed Oct 12 11:49:09 2016 +0200
@@ -168,7 +168,6 @@
       [AS_HELP_STRING([--enable-ccache],
       [enable using ccache to speed up recompilations @<:@disabled@:>@])])
 
-  CCACHE=
   CCACHE_STATUS=
   AC_MSG_CHECKING([is ccache enabled])
   if test "x$enable_ccache" = xyes; then