diff -pruN a52dec-0.7.4.orig/Makefile.am a52dec-0.7.4/Makefile.am
--- a52dec-0.7.4.orig/Makefile.am	2011-10-05 15:17:46.538118579 +0000
+++ a52dec-0.7.4/Makefile.am	2011-10-05 15:18:12.013374560 +0000
@@ -1,3 +1,5 @@
+ACLOCAL_AMFLAGS = -I m4
+
 SUBDIRS = autotools include doc liba52 libao src vc++ test
 
 EXTRA_DIST = HISTORY bootstrap
diff -pruN a52dec-0.7.4.orig/configure.in a52dec-0.7.4/configure.in
--- a52dec-0.7.4.orig/configure.in	2011-10-05 15:17:46.537119079 +0000
+++ a52dec-0.7.4/configure.in	2011-10-05 15:18:12.013374560 +0000
@@ -1,6 +1,7 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ(2.52)
 AC_INIT
+AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([src/a52dec.c])
 AC_CONFIG_AUX_DIR(autotools)
 AC_CONFIG_FILES([Makefile autotools/Makefile include/Makefile test/Makefile
@@ -32,15 +33,9 @@ if test x"$GCC" = x"yes"; then
 
     dnl arch-specific flags
     case "$host" in
-    i?86-* | k?-*)
-	case "$host" in
-	i386-*) OPT_CFLAGS="$CFLAGS -mcpu=i386";;
-	i486-*) OPT_CFLAGS="$CFLAGS -mcpu=i486";;
-	i586-*) OPT_CFLAGS="$CFLAGS -mcpu=pentium";;
-	i686-*) OPT_CFLAGS="$CFLAGS -mcpu=pentiumpro";;
-	k6-*)   OPT_CFLAGS="$CFLAGS -mcpu=k6";;
-	esac
-	AC_TRY_CFLAGS([$OPT_CFLAGS],[CFLAGS=$OPT_CFLAGS]);;
+    x86_64-*)
+        OPT_CFLAGS="$CFLAGS -fPIC"
+        AC_TRY_CFLAGS([$OPT_CFLAGS],[CFLAGS=$OPT_CFLAGS]);;
     sparc-* | sparc64-*)
 	OPT_CFLAGS="$CFLAGS -mtune=ultrasparc"
 	AC_TRY_CFLAGS([$OPT_CFLAGS],[CFLAGS=$OPT_CFLAGS]);;
diff -pruN a52dec-0.7.4.orig/liba52/Makefile.am a52dec-0.7.4/liba52/Makefile.am
--- a52dec-0.7.4.orig/liba52/Makefile.am	2011-10-05 15:17:46.536119579 +0000
+++ a52dec-0.7.4/liba52/Makefile.am	2011-10-05 15:18:12.014374060 +0000
@@ -1,4 +1,4 @@
-CFLAGS = @CFLAGS@ @LIBA52_CFLAGS@
+AM_CFLAGS = @CFLAGS@ @LIBA52_CFLAGS@
 
 lib_LTLIBRARIES = liba52.la
 
diff -pruN a52dec-0.7.4.orig/liba52/configure.incl a52dec-0.7.4/liba52/configure.incl
--- a52dec-0.7.4.orig/liba52/configure.incl	2011-10-05 15:17:46.535120079 +0000
+++ a52dec-0.7.4/liba52/configure.incl	2011-10-05 15:18:32.540106045 +0000
@@ -2,7 +2,7 @@ AC_SUBST([LIBA52_CFLAGS])
 AC_SUBST([LIBA52_LIBS])
 
 dnl avoid -fPIC when possible
-LIBA52_CFLAGS="$LIBA52_CFLAGS -prefer-non-pic"
+dnl LIBA52_CFLAGS="$LIBA52_CFLAGS -prefer-non-pic"
 
 AC_ARG_ENABLE([double],
     [  --enable-double         use double-precision samples])
diff -pruN a52dec-0.7.4.orig/src/Makefile.am a52dec-0.7.4/src/Makefile.am
--- a52dec-0.7.4.orig/src/Makefile.am	2011-10-05 15:17:46.535120079 +0000
+++ a52dec-0.7.4/src/Makefile.am	2011-10-05 15:18:12.014374060 +0000
@@ -1,4 +1,4 @@
-CFLAGS = @A52DEC_CFLAGS@
+AM_CFLAGS = @A52DEC_CFLAGS@
 
 bin_PROGRAMS = a52dec extract_a52
 a52dec_SOURCES = a52dec.c getopt.c gettimeofday.c