From: Jan Engelhardt <jengelh@inai.de>
Date: 2018-01-08 13:48:59+0100

Use LZMA system libraries instead of bundled code.

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

Index: gzdoom-g4.12.2/CMakeLists.txt
===================================================================
--- gzdoom-g4.12.2.orig/CMakeLists.txt
+++ gzdoom-g4.12.2/CMakeLists.txt
@@ -50,6 +50,7 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 
 list( APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake )
 include( FindPackageHandleStandardArgs )
+include(FindPkgConfig)
 
 # Support cross compiling
 option( FORCE_CROSSCOMPILE "Turn on cross compiling." NO )
@@ -385,7 +386,7 @@ else()
 	set( BZIP2_LIBRARY bz2 )
 endif()
 
-set( LZMA_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/libraries/lzma/C" )
+pkg_check_modules(LZMA REQUIRED clzma)
 
 if( NOT CMAKE_CROSSCOMPILING )
 	if( NOT CROSS_EXPORTS )
@@ -405,7 +406,6 @@ install(DIRECTORY docs/
 
 option( DYN_OPENAL "Dynamically load OpenAL" ON )
 
-add_subdirectory( libraries/lzma )
 add_subdirectory( libraries/miniz )
 add_subdirectory( tools )
 add_subdirectory( wadsrc )
Index: gzdoom-g4.12.2/src/CMakeLists.txt
===================================================================
--- gzdoom-g4.12.2.orig/src/CMakeLists.txt
+++ gzdoom-g4.12.2/src/CMakeLists.txt
@@ -383,7 +383,7 @@ else()
 	message( SEND_ERROR "Could not find libvpx" )
 endif()
 
-include_directories( SYSTEM "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" "${ZMUSIC_INCLUDE_DIR}" "${DRPC_INCLUDE_DIR}")
+include_directories( SYSTEM "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIRS}" "${ZMUSIC_INCLUDE_DIR}" "${DRPC_INCLUDE_DIR}")
 
 if( ${HAVE_VM_JIT} )
 	add_definitions( -DHAVE_VM_JIT )
@@ -1267,7 +1267,7 @@ if( UNIX )
 	endif()
 endif()
 
-target_link_libraries( zdoom ${PROJECT_LIBRARIES} lzma ${ZMUSIC_LIBRARIES} )
+target_link_libraries( zdoom ${PROJECT_LIBRARIES} ${LZMA_LIBRARIES} ${ZMUSIC_LIBRARIES} )
 
 include_directories(
 	BEFORE
Index: gzdoom-g4.12.2/tools/zipdir/CMakeLists.txt
===================================================================
--- gzdoom-g4.12.2.orig/tools/zipdir/CMakeLists.txt
+++ gzdoom-g4.12.2/tools/zipdir/CMakeLists.txt
@@ -1,9 +1,9 @@
 cmake_minimum_required( VERSION 3.16 )
 
 if( NOT CMAKE_CROSSCOMPILING )
-	include_directories( SYSTEM "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIR}" )
+	include_directories( SYSTEM "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIRS}" )
 	add_executable( zipdir
 		zipdir.c )
-	target_link_libraries( zipdir miniz ${BZIP2_LIBRARIES} lzma )
+	target_link_libraries( zipdir miniz ${BZIP2_LIBRARIES} ${LZMA_LDFLAGS} )
 	set( CROSS_EXPORTS ${CROSS_EXPORTS} zipdir PARENT_SCOPE )
 endif()