diff --git a/CMakeLists.txt b/CMakeLists.txt
index c453d23e..66b4aa24 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -478,6 +478,8 @@ if(NCNN_VULKAN)
 
             find_package(Threads)
 
+            include("${GLSLANG_TARGET_DIR}/SPIRV-Tools/SPIRV-ToolsTarget.cmake")
+            include("${GLSLANG_TARGET_DIR}/SPIRV-Tools-opt/SPIRV-Tools-optTargets.cmake")
             include("${GLSLANG_TARGET_DIR}/OSDependentTargets.cmake")
             include("${GLSLANG_TARGET_DIR}/OGLCompilerTargets.cmake")
             if(EXISTS "${GLSLANG_TARGET_DIR}/HLSLTargets.cmake")
diff --git a/src/ncnn.pc.in b/src/ncnn.pc.in
index b580fcee..be2becd0 100644
--- a/src/ncnn.pc.in
+++ b/src/ncnn.pc.in
@@ -1,6 +1,6 @@
 prefix=${pcfiledir}/../..
-librarydir=${prefix}/@CMAKE_INSTALL_LIBDIR@
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+librarydir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
 
 Name: @CMAKE_PROJECT_NAME@
 Description: high-performance neural network inference framework optimized for the mobile platform