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