Update build system
diff --git a/configure.ac b/configure.ac
index 721c912..56c6323 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,6 +9,7 @@
 AC_PROG_LIBTOOL dnl ([1.4]) Don't remove!
 
 AC_PROG_CC
+AM_PROG_CC_C_O
 AC_PROG_CXX
 
 AC_CHECK_FUNCS(mprotect sysconf getpagesize)