diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9b4a2f5..86f849c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,22 +18,19 @@ include(FetchContent)
 else() 
 FetchContent_Declare(
   pybind11-src
-  GIT_REPOSITORY https://github.com/pybind/pybind11.git
-  GIT_TAG        v2.6.2
+  SOURCE_DIR @pybind11_src@
 )
 FetchContent_MakeAvailable(pybind11-src)
 endif()
 
 FetchContent_Declare(
   cxxopts
-  GIT_REPOSITORY https://github.com/jarro2783/cxxopts.git
-  GIT_TAG        v2.2.1
+  SOURCE_DIR @cxxopts@
 )
 FetchContent_MakeAvailable(cxxopts)
 
 FetchContent_Declare(
   gulrak
-  GIT_REPOSITORY https://github.com/gulrak/filesystem.git
-  GIT_TAG        v1.5.6
+  SOURCE_DIR @ghc_filesystem@
 )
 FetchContent_MakeAvailable(gulrak)