--- /dev/null
+From 3163bf87d7b955d08dedd5ebaccb1b2a86ffdcb9 Mon Sep 17 00:00:00 2001
+From: Simon Howard <fraggle@soulsphere.org>
+Date: Thu, 25 Feb 2016 22:55:04 -0500
+Subject: [PATCH] configure: Switch to pkg-config macros.
+
+All dependency libraries install pkg-config .pc files nowadays, which
+makes the process of looking them up a lot simpler. Get rid of the SDL
+workaround macro as it's not needed.
+
+[Backported from upstream commit 3163bf87d7b955d08dedd5ebaccb1b2a86ffdcb9.
+Fixes static linking issues with SDL_mixer.]
+
+Signed-off-by: Rodrigo Rebello <rprebello@gmail.com>
+---
+ configure.ac | 117 ++++++++++++++--------------------------
+ opl/examples/Makefile.am | 2 +-
+ src/Makefile.am | 7 ++-
+ textscreen/Makefile.am | 2 +-
+ textscreen/examples/Makefile.am | 2 +-
+ 5 files changed, 49 insertions(+), 81 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 7b03485..48f83ef 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -33,89 +33,54 @@ then
+ CFLAGS="-O$OPT_LEVEL -g $WARNINGS $orig_CFLAGS"
+ fi
+
+-dnl Search for SDL ...
+-
+-AM_PATH_SDL(1.1.3)
+-
+-# Add the SDL compiler flags to the default compiler flag variables.
+-# It is important to do this now, before checking for headers and
+-# library functions. The reason being that on Windows, sdl-config
+-# sets the -mno-cygwin compiler option in order to generate MinGW
+-# executables. If we don't do this now, we might end up discovering
+-# header files that are not actually available to us when we come
+-# to compile.
+-
+-CFLAGS="$CFLAGS $SDL_CFLAGS"
+-LDFLAGS="$LDFLAGS $SDL_LIBS"
+-
+-# On some platforms, SDL renames main() to SDL_main() using a #define,
+-# so that its own main, stored in the SDLmain library, can be run first.
+-# Unfortunately, this causes problems for autoconf, which builds
+-# test programs to probe the system. All library/header/symbol checks
+-# must be run in this block, that performs a workaround for the problem.
+-
+-AC_SDL_MAIN_WORKAROUND([
+-
+- # Check for SDL_mixer.
+-
+- AC_CHECK_LIB(SDL_mixer,Mix_LoadMUS,[
+- SDLMIXER_LIBS="$SDLMIXER_LIBS -lSDL_mixer"
+- ],[
+- echo "*** Could not find SDL_mixer. Please install it."
+- exit -1
+- ])
+-
+- # Check for SDL_net.
+-
+- AC_CHECK_LIB(SDL_net,SDLNet_UDP_Send,[
+- SDLNET_LIBS="$SDLNET_LIBS -lSDL_net"
+- ],[
+- echo "*** Could not find SDL_net. Please install it."
+- exit -1
+- ])
+-
+- # Check for libsamplerate.
+- AC_ARG_WITH([libsamplerate],
+- AS_HELP_STRING([--without-libsamplerate],
+- [Build without libsamplerate @<:@default=check@:>@]),
+- [],
+- [
+- [with_libsamplerate=check]
+- ])
+- AS_IF([test "x$with_libsamplerate" != xno], [
+- AC_CHECK_LIB(samplerate, src_new, [], [
+- AS_IF([test "x$with_libsamplerate" != xcheck], [AC_MSG_FAILURE(
+- [--with-libsamplerate was given, but test for libsamplerate failed])
+- ])
++PKG_CHECK_MODULES([SDL], [sdl])
++PKG_CHECK_MODULES([SDLMIXER], [SDL_mixer])
++PKG_CHECK_MODULES([SDLNET], [SDL_net])
++
++# Check for libsamplerate.
++AC_ARG_WITH([libsamplerate],
++AS_HELP_STRING([--without-libsamplerate],
++ [Build without libsamplerate @<:@default=check@:>@]),
++[],
++[
++ [with_libsamplerate=check]
++])
++AS_IF([test "x$with_libsamplerate" != xno], [
++ PKG_CHECK_MODULES([SAMPLERATE], [samplerate >= 0.1.8], [
++ AC_DEFINE([HAVE_LIBSAMPLERATE], [1], [libsamplerate installed])
++ ], [
++ AS_IF([test "x$with_libsamplerate" != xcheck], [AC_MSG_FAILURE(
++ [--with-libsamplerate was given, but test for libsamplerate failed])
+ ])
+ ])
+- # Check for libpng.
+- AC_ARG_WITH([libpng],
+- AS_HELP_STRING([--without-libpng],
+- [Build without libpng @<:@default=check@:>@]),
+- [],
+- [
+- [with_libpng=check]
+- ])
+- AS_IF([test "x$with_libpng" != xno], [
+- AC_CHECK_LIB(z, zlibVersion)
+- AC_CHECK_LIB(png, png_get_io_ptr, [], [
+- AS_IF([test "x$with_libpng" != xcheck], [AC_MSG_FAILURE(
+- [--with-libpng was given, but test for libpng failed])
+- ])
++])
++# Check for libpng.
++AC_ARG_WITH([libpng],
++AS_HELP_STRING([--without-libpng],
++ [Build without libpng @<:@default=check@:>@]),
++[],
++[
++ [with_libpng=check]
++])
++AS_IF([test "x$with_libpng" != xno], [
++ PKG_CHECK_MODULES([PNG], [libpng >= 1.6.10], [
++ AC_DEFINE([HAVE_LIBPNG], [1], [libpng installed])
++ ], [
++ AS_IF([test "x$with_libpng" != xcheck], [AC_MSG_FAILURE(
++ [--with-libpng was given, but test for libpng failed])
+ ])
+ ])
+- AC_CHECK_LIB(m, log)
++])
++AC_CHECK_LIB(m, log)
+
+- AC_CHECK_HEADERS([linux/kd.h dev/isa/spkrio.h dev/speaker/speaker.h])
+- AC_CHECK_FUNCS(mmap ioperm)
++AC_CHECK_HEADERS([linux/kd.h dev/isa/spkrio.h dev/speaker/speaker.h])
++AC_CHECK_FUNCS(mmap ioperm)
+
+- # OpenBSD I/O i386 library for I/O port access.
+- # (64 bit has the same thing with a different name!)
++# OpenBSD I/O i386 library for I/O port access.
++# (64 bit has the same thing with a different name!)
+
+- AC_CHECK_LIB(i386, i386_iopl)
+- AC_CHECK_LIB(amd64, amd64_iopl)
+-])
++AC_CHECK_LIB(i386, i386_iopl)
++AC_CHECK_LIB(amd64, amd64_iopl)
+
+ case $host in
+ *cygwin* | *mingw* )
+diff --git a/opl/examples/Makefile.am b/opl/examples/Makefile.am
+index 9afcd51..54c37f8 100644
+--- a/opl/examples/Makefile.am
++++ b/opl/examples/Makefile.am
+@@ -1,5 +1,5 @@
+
+-AM_CFLAGS = -I$(top_srcdir)/opl
++AM_CFLAGS = -I$(top_srcdir)/opl @SDL_CFLAGS@
+
+ noinst_PROGRAMS=droplay
+
+diff --git a/src/Makefile.am b/src/Makefile.am
+index 78ee3ba..9624e01 100644
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -21,7 +21,8 @@ execgames_SCRIPTS = $(SETUP_BINARIES)
+ AM_CFLAGS = -I$(top_srcdir)/textscreen \
+ -I$(top_srcdir)/opl \
+ -I$(top_srcdir)/pcsound \
+- @SDLMIXER_CFLAGS@ @SDLNET_CFLAGS@
++ @SDLMIXER_CFLAGS@ @SDLNET_CFLAGS@ \
++ @SAMPLERATE_CFLAGS@ @PNG_CFLAGS@
+
+ # Common source files used by absolutely everything:
+
+@@ -150,7 +151,9 @@ EXTRA_LIBS = \
+ @LDFLAGS@ \
+ @SDL_LIBS@ \
+ @SDLMIXER_LIBS@ \
+- @SDLNET_LIBS@
++ @SDLNET_LIBS@ \
++ @SAMPLERATE_LIBS@ \
++ @PNG_LIBS@
+
+ if HAVE_WINDRES
+ @PROGRAM_PREFIX@doom_SOURCES=$(SOURCE_FILES_WITH_DEH) resource.rc
+diff --git a/textscreen/Makefile.am b/textscreen/Makefile.am
+index 628d4ff..427ed40 100644
+--- a/textscreen/Makefile.am
++++ b/textscreen/Makefile.am
+@@ -1,5 +1,5 @@
+
+-AM_CFLAGS = -I$(top_srcdir)/src
++AM_CFLAGS = -I$(top_srcdir)/src @SDL_CFLAGS@
+
+ CTAGS_ARGS=-I TXT_UNCAST_ARG+
+
+diff --git a/textscreen/examples/Makefile.am b/textscreen/examples/Makefile.am
+index 4632d92..b857748 100644
+--- a/textscreen/examples/Makefile.am
++++ b/textscreen/examples/Makefile.am
+@@ -1,5 +1,5 @@
+
+-AM_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/textscreen
++AM_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/textscreen @SDL_CFLAGS@
+
+ noinst_PROGRAMS=guitest calculator
+
+--
+2.1.4
+
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