File icecast-fix-no-add-needed.patch of Package icecast

--- configure.ac.orig	2018-04-04 11:41:23.542357864 +0000
+++ configure.ac	2018-04-04 11:41:33.358507645 +0000
@@ -8,7 +9,8 @@
 AM_CONFIG_HEADER([config.h])
 AM_MAINTAINER_MODE
 
-AC_PROG_CC
+AC_PROG_CC_STDC
+AC_USE_SYSTEM_EXTENSIONS
 AC_PROG_AWK
 AC_CANONICAL_HOST
 AC_PROG_LIBTOOL
@@ -22,7 +24,6 @@
 else
     XIPH_CPPFLAGS="-Wall -ffast-math -fsigned-char"
     PROFILE="-pg -g"
-    AC_DEFINE([_GNU_SOURCE], 1, [Define to include GNU extensions to POSIX])
 fi
 
 dnl Checks for programs.
@@ -52,10 +53,12 @@
 XIPH_NET
 
 dnl -- configure options --
-
+XIPH_PATH_XML
 XIPH_PATH_XSLT
 XIPH_VAR_APPEND([XIPH_CPPFLAGS],[$XSLT_CFLAGS])
 XIPH_VAR_PREPEND([XIPH_LIBS],[$XSLT_LIBS])
+XIPH_VAR_APPEND([XIPH_CPPFLAGS],[$XML_CFLAGS])
+XIPH_VAR_PREPEND([XIPH_LIBS],[$XML_LIBS])
 
 XIPH_PATH_VORBIS([
     XIPH_VAR_APPEND([XIPH_CPPFLAGS],[$VORBIS_CFLAGS])