diff -urN fftw-3.1.2.org/configure.ac fftw-3.1.2/configure.ac
--- fftw-3.1.2.org/configure.ac	2006-07-04 02:42:46.000000000 +0200
+++ fftw-3.1.2/configure.ac	2006-11-26 19:23:15.566663500 +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