--- a/common/autoconf/build-performance.m4	Wed Jul 05 21:49:00 2017 +0200
+++ b/common/autoconf/build-performance.m4	Tue Jun 07 15:42:20 2016 +0200
@@ -383,7 +383,7 @@
       else
         AC_MSG_RESULT([yes])
       fi
-      rm -f conftest.h conftest.hpp.gch
+      $RM conftest.h conftest.hpp.gch
     fi
   fi