--- configure.ac.orig	2008-03-31 23:03:45.200210228 +0100
+++ configure.ac	2008-03-31 23:06:57.111081976 +0100
@@ -135,7 +135,7 @@
 AC_PROG_CC
 AX_COMPILER_VENDOR
 AC_PROG_CC_STDC
-AMX_PROG_AS     dnl AM_PROG_AS breaks at least one version of libtool
+AM_PROG_AS
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
@@ -229,6 +229,8 @@
 fi
 fi
 AC_SUBST(SIMD_CFLAGS)
+# pass simd flags to preprocessor/compiler for proper intrinsics detection.
+CPPFLAGS="$CPPFLAGS $SIMD_CFLAGS"
 
 dnl Checks for header files.
 AC_HEADER_STDC