diff --git a/glslang.changes b/glslang.changes
index fd7c487..b1acaa2 100644
--- a/glslang.changes
+++ b/glslang.changes
@@ -1,8 +1,3 @@
--------------------------------------------------------------------
-Tue Nov 19 08:41:02 UTC 2019 - Jan Engelhardt <jengelh@inai.de>
-
-- Enable HLSL optimizer. Add opt.diff.
-
 -------------------------------------------------------------------
 Thu Nov  7 08:25:53 UTC 2019 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/glslang.spec b/glslang.spec
index a6ea7ff..9264dcc 100644
--- a/glslang.spec
+++ b/glslang.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package glslang
 #
-# Copyright (c) 2019 SUSE LLC.
+# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -31,14 +31,12 @@ URL:            https://www.khronos.org/opengles/sdk/tools/Reference-Compiler/
 
 Source:         %name-%version.tar.xz
 Patch1:         ver.diff
-Patch2:         opt.diff
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  bison
 BuildRequires:  cmake >= 2.8
 BuildRequires:  fdupes
 BuildRequires:  gcc-c++
 BuildRequires:  python3-base
-BuildRequires:  spirv-tools-devel
 
 %description
 glslang is a compiler front end for the OpenGL ES and OpenGL shading
@@ -78,7 +76,7 @@ compressor's dictionary can find better cross module commonality.
 %build
 %global _lto_cflags %{_lto_cflags} -ffat-lto-objects
 # Trim -Wl,--no-undefined for now (https://github.com/KhronosGroup/glslang/issues/1484)
-%cmake -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--as-needed -Wl,-z,now" -DENABLE_OPT=ON
+%cmake -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--as-needed -Wl,-z,now"
 make %{?_smp_mflags}
 
 %install
diff --git a/opt.diff b/opt.diff
deleted file mode 100644
index 10ad636..0000000
--- a/opt.diff
+++ /dev/null
@@ -1,19 +0,0 @@
----
- CMakeLists.txt |    4 ----
- 1 file changed, 4 deletions(-)
-
-Index: glslang-7.13.3496/CMakeLists.txt
-===================================================================
---- glslang-7.13.3496.orig/CMakeLists.txt
-+++ glslang-7.13.3496/CMakeLists.txt
-@@ -163,10 +163,6 @@ if(BUILD_EXTERNAL AND IS_DIRECTORY ${CMA
- 	add_subdirectory(External)
- endif()
- 
--if(NOT TARGET SPIRV-Tools-opt)
--    set(ENABLE_OPT OFF)
--endif()
--
- if(ENABLE_OPT)
-     message(STATUS "optimizer enabled")
-     add_definitions(-DENABLE_OPT=1)
diff --git a/ver.diff b/ver.diff
index f9187ea..f38f057 100644
--- a/ver.diff
+++ b/ver.diff
@@ -26,7 +26,7 @@ Index: glslang-7.13.3496/SPIRV/CMakeLists.txt
      doc.h)
  
  add_library(SPIRV ${LIB_TYPE} ${SOURCES} ${HEADERS})
-+set_target_properties(SPIRV PROPERTIES SOVERSION suse9)
++set_target_properties(SPIRV PROPERTIES SOVERSION suse8)
  set_property(TARGET SPIRV PROPERTY FOLDER glslang)
  set_property(TARGET SPIRV PROPERTY POSITION_INDEPENDENT_CODE ON)
  target_include_directories(SPIRV PUBLIC 
@@ -34,7 +34,7 @@ Index: glslang-7.13.3496/SPIRV/CMakeLists.txt
  
  if (ENABLE_SPVREMAPPER)
      add_library(SPVRemapper ${LIB_TYPE} ${SPVREMAP_SOURCES} ${SPVREMAP_HEADERS})
-+    set_target_properties(SPVRemapper PROPERTIES SOVERSION suse9)
++    set_target_properties(SPVRemapper PROPERTIES SOVERSION suse8)
      set_property(TARGET SPVRemapper PROPERTY FOLDER glslang)
      set_property(TARGET SPVRemapper PROPERTY POSITION_INDEPENDENT_CODE ON)
  endif()
@@ -45,7 +45,7 @@ Index: glslang-7.13.3496/StandAlone/CMakeLists.txt
 @@ -1,5 +1,6 @@
  add_library(glslang-default-resource-limits
              ${CMAKE_CURRENT_SOURCE_DIR}/ResourceLimits.cpp)
-+set_target_properties(glslang-default-resource-limits PROPERTIES SOVERSION suse9)
++set_target_properties(glslang-default-resource-limits PROPERTIES SOVERSION suse8)
  set_property(TARGET glslang-default-resource-limits PROPERTY FOLDER glslang)
  set_property(TARGET glslang-default-resource-limits PROPERTY POSITION_INDEPENDENT_CODE ON)
  
@@ -57,7 +57,7 @@ Index: glslang-7.13.3496/glslang/CMakeLists.txt
  glslang_pch(SOURCES MachineIndependent/pch.cpp)
  
  add_library(glslang ${LIB_TYPE} ${BISON_GLSLParser_OUTPUT_SOURCE} ${SOURCES} ${HEADERS})
-+set_target_properties(glslang PROPERTIES SOVERSION suse9)
++set_target_properties(glslang PROPERTIES SOVERSION suse8)
  set_property(TARGET glslang PROPERTY FOLDER glslang)
  set_property(TARGET glslang PROPERTY POSITION_INDEPENDENT_CODE ON)
  target_link_libraries(glslang OGLCompiler OSDependent)
@@ -69,7 +69,7 @@ Index: glslang-7.13.3496/hlsl/CMakeLists.txt
  glslang_pch(SOURCES pch.cpp)
  
  add_library(HLSL ${LIB_TYPE} ${SOURCES} ${HEADERS})
-+set_target_properties(HLSL PROPERTIES SOVERSION suse9)
++set_target_properties(HLSL PROPERTIES SOVERSION suse8)
  set_property(TARGET HLSL PROPERTY FOLDER hlsl)
  set_property(TARGET HLSL PROPERTY POSITION_INDEPENDENT_CODE ON)