diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9bc94b01a9fef521c3d9cf9f9505551097f2c656..a0f0352b2dc366651ff00eb31ba1c2b93bc7b85b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,8 @@ option(ENABLE_NV_EXTENSIONS "Enables support of Nvidia-specific extensions" ON)
 
 option(ENABLE_HLSL "Enables HLSL input support" ON)
 
+option(ENABLE_OPT "Enables spirv-opt capability if present" ON)
+
 if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT AND WIN32)
     set(CMAKE_INSTALL_PREFIX "install" CACHE STRING "..." FORCE)
 endif()
@@ -83,6 +85,17 @@ endfunction(glslang_set_link_args)
 # We depend on these for later projects, so they should come first.
 add_subdirectory(External)
 
+if(NOT TARGET SPIRV-Tools-opt)
+    set(ENABLE_OPT OFF)
+endif()
+
+if(ENABLE_OPT)
+    message(STATUS "optimizer enabled")
+    add_definitions(-DENABLE_OPT)
+elseif(ENABLE_HLSL)
+    message(STATUS "spirv-tools not linked - illegal SPIRV may be generated for HLSL")
+endif()
+
 add_subdirectory(glslang)
 add_subdirectory(OGLCompilersDLL)
 if(ENABLE_GLSLANG_BINARIES)
diff --git a/External/CMakeLists.txt b/External/CMakeLists.txt
index 4f694ee746f4c664722219e76449d485dac5641e..d9e071e88375bd2f342d851ffccb92c2feac9d0f 100644
--- a/External/CMakeLists.txt
+++ b/External/CMakeLists.txt
@@ -33,3 +33,10 @@ if(BUILD_TESTING)
             "Google Mock was not found - tests based on that will not build")
     endif()
 endif()
+
+if(ENABLE_OPT AND NOT TARGET SPIRV-Tools-opt)
+    if(IS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/spirv-tools)
+        add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/spirv-tools spirv-tools)
+    endif()
+endif()
+
diff --git a/SPIRV/CMakeLists.txt b/SPIRV/CMakeLists.txt
index 3c5ebaba7f562ed9a742542a457933b6b5471a0a..b1c02777961b5615d0dae2e943c3610c9c347791 100755
--- a/SPIRV/CMakeLists.txt
+++ b/SPIRV/CMakeLists.txt
@@ -42,12 +42,21 @@ endif(ENABLE_NV_EXTENSIONS)
 add_library(SPIRV STATIC ${SOURCES} ${HEADERS})
 set_property(TARGET SPIRV PROPERTY FOLDER glslang)
 set_property(TARGET SPIRV PROPERTY POSITION_INDEPENDENT_CODE ON)
-target_link_libraries(SPIRV glslang)
 
 add_library(SPVRemapper STATIC ${SPVREMAP_SOURCES} ${SPVREMAP_HEADERS})
 set_property(TARGET SPVRemapper PROPERTY FOLDER glslang)
 set_property(TARGET SPVRemapper PROPERTY POSITION_INDEPENDENT_CODE ON)
 
+if(ENABLE_OPT)
+    target_include_directories(SPIRV
+        PRIVATE ${spirv-tools_SOURCE_DIR}/include
+        PRIVATE ${spirv-tools_SOURCE_DIR}/source
+    )
+    target_link_libraries(SPIRV glslang SPIRV-Tools-opt SPVRemapper)
+else()
+    target_link_libraries(SPIRV glslang)
+endif(ENABLE_OPT)
+
 if(WIN32)
     source_group("Source" FILES ${SOURCES} ${HEADERS})
     source_group("Source" FILES ${SPVREMAP_SOURCES} ${SPVREMAP_HEADERS})