diff --git a/build/config/sched_setaffinity.m4 b/build/config/sched_setaffinity.m4
index d458dbb069..ac81896fcd 100644
--- a/build/config/sched_setaffinity.m4
+++ b/build/config/sched_setaffinity.m4
@@ -7,10 +7,13 @@ AC_CHECK_FUNCS(sched_setaffinity sched_getaffinity)
 	if test "$ac_cv_func_sched_setaffinity" = "yes" ; then
         AC_CACHE_CHECK([whether the CPU_SET and CPU_ZERO macros are defined],
         ac_cv_cpu_set_defined,[
+	saved_CFLAGS="$CFLAGS"
+	CFLAGS="$CFLAGS $SWITCH_AM_CFLAGS"
         AC_TRY_COMPILE( [#include <sched.h>],[ cpu_set_t t; CPU_ZERO(&t); CPU_SET(1,&t); ],
 	        ac_cv_cpu_set_defined=yes,ac_cv_cpu_set_defined=no)])
         if test "$ac_cv_cpu_set_defined" = "yes" ; then
         	AC_DEFINE(HAVE_CPU_SET_MACROS,1,[Define if CPU_SET and CPU_ZERO defined])
         fi
+	CFLAGS="$saved_CFLAGS"
 	fi
-])
\ No newline at end of file
+])