diff --git a/Makefile.am b/Makefile.am
index 14ce287..f5d57c6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,7 +5,7 @@
 ################################################################
 
 AM_CPPFLAGS = -D$(OS)
-AM_CFLAGS = -g -Wall -pedantic
+AM_CFLAGS = -g -pedantic
 
 
 ################################################################
diff --git a/configure.ac b/configure.ac
index 2d4e90d..3d241b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,6 +56,7 @@ AC_PROG_CC
 AC_PROG_CC_STDC
 AS_IF([test "x${ac_cv_prog_cc_stdc}" = xno],
       [AC_MSG_WARN([Unable to engage Standard C (C99) option])],)
+AX_CFLAGS_WARN_ALL
 AC_PROG_INSTALL
 
 # Process options