diff --git a/gzdoom-vulkan.patch b/gzdoom-vulkan.patch
index d3f5071..bdc8a3a 100644
--- a/gzdoom-vulkan.patch
+++ b/gzdoom-vulkan.patch
@@ -4,26 +4,38 @@ Date: 2019-04-13 15:02:22.799297208 +0200
 Use Vulkan system libraries instead of bundled code.
 
 ---
- CMakeLists.txt                                     |    3 ---
- src/CMakeLists.txt                                 |    2 +-
- src/common/rendering/vulkan/shaders/vk_shader.cpp  |    2 +-
- src/common/rendering/vulkan/system/vk_builders.cpp |    4 ++--
- 4 files changed, 4 insertions(+), 7 deletions(-)
+ CMakeLists.txt                         |    4 +---
+ libraries/glslang/spirv/CMakeLists.txt |    1 +
+ src/CMakeLists.txt                     |    2 +-
+ 3 files changed, 3 insertions(+), 4 deletions(-)
 
 Index: gzdoom-g4.4.0/CMakeLists.txt
 ===================================================================
 --- gzdoom-g4.4.0.orig/CMakeLists.txt
 +++ gzdoom-g4.4.0/CMakeLists.txt
-@@ -307,9 +307,6 @@ option(FORCE_INTERNAL_ASMJIT "Use intern
+@@ -307,9 +307,7 @@ option(FORCE_INTERNAL_ASMJIT "Use intern
  mark_as_advanced( FORCE_INTERNAL_ASMJIT )
  
  if (HAVE_VULKAN)
 -	add_subdirectory( libraries/glslang/glslang)
 -	add_subdirectory( libraries/glslang/spirv )
 -	add_subdirectory( libraries/glslang/OGLCompilersDLL )
++	include_directories(/usr/include/glslang/Public /usr/include/SPIRV)
  endif()
  
  if( ZLIB_FOUND AND NOT FORCE_INTERNAL_ZLIB )
+Index: gzdoom-g4.4.0/libraries/glslang/spirv/CMakeLists.txt
+===================================================================
+--- gzdoom-g4.4.0.orig/libraries/glslang/spirv/CMakeLists.txt
++++ gzdoom-g4.4.0/libraries/glslang/spirv/CMakeLists.txt
+@@ -50,6 +50,7 @@ set(SPVREMAP_HEADERS
+     doc.h)
+ 
+ add_library(SPIRV ${LIB_TYPE} ${SOURCES} ${HEADERS})
++set_property(TARGET SPIRV OUTPUT_NAME libSPIRV-zdoom)
+ set_property(TARGET SPIRV PROPERTY FOLDER glslang)
+ set_property(TARGET SPIRV PROPERTY POSITION_INDEPENDENT_CODE ON)
+ target_include_directories(SPIRV PUBLIC
 Index: gzdoom-g4.4.0/src/CMakeLists.txt
 ===================================================================
 --- gzdoom-g4.4.0.orig/src/CMakeLists.txt
@@ -37,31 +49,3 @@ Index: gzdoom-g4.4.0/src/CMakeLists.txt
  endif()
  include_directories( "${ZLIB_INCLUDE_DIR}" "${BZIP2_INCLUDE_DIR}" "${LZMA_INCLUDE_DIRS}" "${JPEG_INCLUDE_DIR}" "${ZMUSIC_INCLUDE_DIR}" )
  
-Index: gzdoom-g4.4.0/src/common/rendering/vulkan/shaders/vk_shader.cpp
-===================================================================
---- gzdoom-g4.4.0.orig/src/common/rendering/vulkan/shaders/vk_shader.cpp
-+++ gzdoom-g4.4.0/src/common/rendering/vulkan/shaders/vk_shader.cpp
-@@ -25,7 +25,7 @@
- #include "hw_shaderpatcher.h"
- #include "filesystem.h"
- #include "engineerrors.h"
--#include <ShaderLang.h>
-+#include <glslang/Public/ShaderLang.h>
- 
- VkShaderManager::VkShaderManager(VulkanDevice *device) : device(device)
- {
-Index: gzdoom-g4.4.0/src/common/rendering/vulkan/system/vk_builders.cpp
-===================================================================
---- gzdoom-g4.4.0.orig/src/common/rendering/vulkan/system/vk_builders.cpp
-+++ gzdoom-g4.4.0/src/common/rendering/vulkan/system/vk_builders.cpp
-@@ -23,8 +23,8 @@
- #include "vk_builders.h"
- #include "engineerrors.h"
- #include "renderstyle.h"
--#include <ShaderLang.h>
--#include <GlslangToSpv.h>
-+#include <glslang/Public/ShaderLang.h>
-+#include <SPIRV/GlslangToSpv.h>
- 
- static const TBuiltInResource DefaultTBuiltInResource = {
- 	/* .MaxLights = */ 32,
diff --git a/gzdoom.spec b/gzdoom.spec
index 848ed9b..720905d 100644
--- a/gzdoom.spec
+++ b/gzdoom.spec
@@ -28,15 +28,13 @@ URL:            https://zdoom.org/
 Source:         https://github.com/coelckers/gzdoom/archive/g%version.tar.gz
 Patch1:         gzdoom-waddir.patch
 Patch2:         gzdoom-lzma.patch
-Patch3:         gzdoom-vulkan.patch
-Patch4:         gzdoom-asmjit.patch
+Patch3:         gzdoom-asmjit.patch
+Patch4:         gzdoom-vulkan.patch
 BuildRequires:  cmake >= 2.8.7
 BuildRequires:  gcc-c++
-BuildRequires:  glslang-devel
 BuildRequires:  libjpeg-devel
 BuildRequires:  nasm
 BuildRequires:  pkg-config
-BuildRequires:  spirv-tools-devel
 BuildRequires:  unzip
 BuildRequires:  zmusic-devel
 BuildRequires:  pkgconfig(bzip2)
@@ -48,6 +46,11 @@ BuildRequires:  pkgconfig(openal)
 BuildRequires:  pkgconfig(sdl2)
 BuildRequires:  pkgconfig(vulkan)
 BuildRequires:  pkgconfig(zlib)
+%if 0%{?sle_version} >= 150200
+BuildRequires:  glslang-devel >= 6.3
+%else
+Provides:       bundled(glslang) = 8.13.3559
+%endif
 Recommends:     freedoom
 Recommends:     timidity
 Recommends:     timidity-eawpats
@@ -71,8 +74,13 @@ GZDoom is a port (a modification) of the original Doom source code, featuring:
 * Demo record/playback of classic and Boom demos is not supported.
 
 %prep
-%autosetup -p1 -n %name-g%version
-rm -Rfv glslang src/rendering/vulkan/thirdparty/vulkan
+%setup -qn %name-g%version
+%patch -P 1 -P 2 -P 3 -p1
+%if 1 || 0%{?sle_version} >= 150200
+%patch -P 4 -p1
+rm -Rf glslang
+%endif
+rm -Rf src/common/rendering/vulkan/thirdparty/vulkan
 perl -i -pe 's{__DATE__}{""}g' src/posix/sdl/i_main.cpp
 
 %build