Use pkgconfig to check for audiofile since the audiofile-config script was
removed from >=audiofile-0.3.0.

--- normalize-0.7.7/configure.ac.orig
+++ normalize-0.7.7/configure.ac
@@ -248,33 +248,16 @@
 
 
 dnl *** Stuff for audiofile library ***
-dnl v0.2.1 and before have bugs with 24-bit LE files
-AM_PATH_AUDIOFILE([ 0.2.2 ], [ have_audiofile=true ])
-dnl AC_CHECK_LIB(audiofile, afSetVirtualSampleFormat, have_audiofile=true)
+AC_ARG_WITH(audiofile, AC_HELP_STRING([--with-audiofile],
+		   [use the audiofile library (default yes)]))
 AH_TEMPLATE([USE_AUDIOFILE],
 	    [Define if you want to use the audiofile library.])
-AC_ARG_WITH(audiofile,
-    AC_HELP_STRING([--with-audiofile],
-		   [use the audiofile library (default yes)]),
-    [ case "$withval" in
-	  no) with_audiofile=false ;;
-	  *) with_audiofile=true ;;
-      esac ])
 
-use_audiofile=false
-if test x$with_audiofile != xfalse; then
-    if test x$have_audiofile = xtrue; then
-	AC_DEFINE(USE_AUDIOFILE)
-	use_audiofile=true
-dnl	AUDIOFILELIBS="-laudiofile"
-    elif test x$with_audiofile = xtrue; then
-	AC_MSG_ERROR([--with-audiofile specified, but audiofile library not found])
-    fi
-fi
-dnl AC_SUBST(AUDIOFILELIBS)
-test x$use_audiofile = xfalse && AUDIOFILE_LIBS=
-test x$use_audiofile = xfalse && AUDIOFILE_CFLAGS=
-AM_CONDITIONAL(AUDIOFILE, test x$use_audiofile = xtrue)
+AS_IF([test "x$with_audiofile" = "xyes"], [
+    PKG_CHECK_MODULES([AUDIOFILE], [audiofile])
+    AC_DEFINE(USE_AUDIOFILE)
+])
+AM_CONDITIONAL(AUDIOFILE, test x$with_audiofile = xyes)
 
 
 dnl *** Stuff for mad mpeg audio decoder library ***
@@ -330,7 +313,7 @@
 
 echo
 echo "Configuration:"
-echo "    audiofile library:         $use_audiofile"
+echo "    audiofile library:         $with_audiofile"
 echo "    mpeg audio support:        $use_mad"
 echo "    xmms volume adjust plugin: $use_xmms"
 echo