1diff --git a/CMakeLists.txt b/CMakeLists.txt
2index 785e2cd..459024d 100644
3--- a/CMakeLists.txt
4+++ b/CMakeLists.txt
5@@ -589,7 +589,8 @@ endif()
6 if(NCNN_VULKAN)
7 if(NCNN_SYSTEM_GLSLANG)
8 find_package(Threads)
9- find_package(glslang QUIET)
10+ find_package(SPIRV-Tools-opt REQUIRED)
11+ find_package(glslang REQUIRED)
12 if(glslang_FOUND)
13 add_library(glslang ALIAS glslang::glslang)
14 add_library(SPIRV ALIAS glslang::SPIRV)
15@@ -601,7 +602,6 @@ if(NCNN_VULKAN)
16 set(NCNN_SYSTEM_GLSLANG OFF)
17 else()
18 include("${GLSLANG_TARGET_DIR}/OSDependentTargets.cmake")
19- include("${GLSLANG_TARGET_DIR}/OGLCompilerTargets.cmake")
20 if(EXISTS "${GLSLANG_TARGET_DIR}/HLSLTargets.cmake")
21 # hlsl support can be optional
22 include("${GLSLANG_TARGET_DIR}/HLSLTargets.cmake")
23diff --git a/src/ncnn.pc.in b/src/ncnn.pc.in
24index b580fce..be2becd 100644
25--- a/src/ncnn.pc.in
26+++ b/src/ncnn.pc.in
27@@ -1,6 +1,6 @@
28 prefix=${pcfiledir}/../..
29-librarydir=${prefix}/@CMAKE_INSTALL_LIBDIR@
30-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
31+librarydir=@CMAKE_INSTALL_FULL_LIBDIR@
32+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
33
34 Name: @CMAKE_PROJECT_NAME@
35 Description: high-performance neural network inference framework optimized for the mobile platform