From: Jan Engelhradt <jengelh@inai.de>
Date: 2018-01-08 13:45:39.937133591 +0100

Use system-provided LZMA SDK.

---
 CMakeLists.txt              |    4 ++--
 src/CMakeLists.txt          |    4 ++--
 tools/zipdir/CMakeLists.txt |    4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

Index: gzdoom-3.2.5/CMakeLists.txt
===================================================================
--- gzdoom-3.2.5.orig/CMakeLists.txt
+++ gzdoom-3.2.5/CMakeLists.txt
@@ -13,6 +13,7 @@ endif()
 list( APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake )
 include( CreateLaunchers )
 include( FindPackageHandleStandardArgs )
+include(FindPkgConfig)
 
 # Produce a warning if XP support will be missing.
 if( MSVC )
@@ -311,7 +312,7 @@ else()
 	set( GME_LIBRARIES gme )
 endif()
 
-set( LZMA_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/lzma/C" )
+pkg_check_modules(LZMA REQUIRED clzma)
 
 if( NOT CMAKE_CROSSCOMPILING )
 	if( NOT CROSS_EXPORTS )
@@ -329,7 +330,6 @@ install(DIRECTORY docs/
 		DESTINATION ${INSTALL_DOCS_PATH} 
 		COMPONENT "Documentation")
 
-add_subdirectory( lzma )
 add_subdirectory( tools )
 add_subdirectory( dumb )
 add_subdirectory( gdtoa )
Index: gzdoom-3.2.5/src/CMakeLists.txt
===================================================================
--- gzdoom-3.2.5.orig/src/CMakeLists.txt
+++ gzdoom-3.2.5/src/CMakeLists.txt
@@ -454,7 +454,7 @@ add_custom_target( revision_check ALL
 
 message( STATUS "Fluid synth libs: ${FLUIDSYNTH_LIBRARIES}" )
 set( ZDOOM_LIBS ${ZDOOM_LIBS} "${ZLIB_LIBRARIES}" "${JPEG_LIBRARIES}" "${BZIP2_LIBRARIES}" "${GME_LIBRARIES}" "${CMAKE_DL_LIBS}" )
-include_directories( "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" "${JPEG_INCLUDE_DIR}" "${GME_INCLUDE_DIR}" )
+include_directories( "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIRS}" "${JPEG_INCLUDE_DIR}" "${GME_INCLUDE_DIR}" )
 
 if( SNDFILE_FOUND )
     set( ZDOOM_LIBS ${ZDOOM_LIBS} "${SNDFILE_LIBRARIES}" )
@@ -1220,7 +1220,7 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL "SunOS"
 	set( ZDOOM_LIBS ${ZDOOM_LIBS} nsl socket)
 endif()
 
-target_link_libraries( zdoom ${ZDOOM_LIBS} gdtoa dumb lzma )
+target_link_libraries( zdoom ${ZDOOM_LIBS} gdtoa dumb ${LZMA_LIBRARIES})
 
 include_directories( .
 	g_statusbar
Index: gzdoom-3.2.5/tools/zipdir/CMakeLists.txt
===================================================================
--- gzdoom-3.2.5.orig/tools/zipdir/CMakeLists.txt
+++ gzdoom-3.2.5/tools/zipdir/CMakeLists.txt
@@ -1,9 +1,9 @@
 cmake_minimum_required( VERSION 2.8.7 )
 
 if( NOT CMAKE_CROSSCOMPILING )
-	include_directories( "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" )
+	include_directories( "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIRS}" )
 	add_executable( zipdir
 		zipdir.c )
-	target_link_libraries( zipdir ${ZLIB_LIBRARIES} ${BZIP2_LIBRARIES} lzma )
+	target_link_libraries( zipdir ${ZLIB_LIBRARIES} ${BZIP2_LIBRARIES} ${LZMA_LDFLAGS})
 	set( CROSS_EXPORTS ${CROSS_EXPORTS} zipdir PARENT_SCOPE )
 endif()