diff --git a/README.md b/README.md
index 7904838..46164b2 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 Basic C and C++ devcontainer with cmake, compiler warnings, clang-tidy and clang-format.
 
-## Installed tools
+### Installed tools
 
 * ccache
 * clang
diff --git a/cmake/cpprog.cmake b/cmake/cpprog.cmake
index 1a35398..7bc79d9 100644
--- a/cmake/cpprog.cmake
+++ b/cmake/cpprog.cmake
@@ -10,6 +10,7 @@ macro(cpprog_init)
 endmacro()
 
 macro(cpprog_configure_project)
+    _cpprog_check_compiler_supported()
     _cpprog_clion_clangd_workaround()
     _cpprog_enable_testing()
 endmacro()
@@ -62,10 +63,17 @@ function(_cpprog_generate_debuginit)
     configure_file("${CMAKE_SOURCE_DIR}/lldbinit.in" "${CMAKE_SOURCE_DIR}/.lldbinit")
 endfunction()
 
+function(_cpprog_check_compiler_supported)
+    if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+        message(FATAL_ERROR "Compiler ${CMAKE_CXX_COMPILER_ID} is not supported!")
+    endif()
+endfunction()
+
 function(_cpprog_clion_clangd_workaround)
     if($ENV{CLION_IDE})
         message(STATUS "[cpprog] Detected clion, applying workaround for module std.")
-        set(cpprog_LIBCXX_DIR "/usr/lib/llvm-20/share/libc++/v1")
+        set(cpprog_LIBCXX_DIR "../../../share/libc++/v1")
+        cmake_path(ABSOLUTE_PATH cpprog_LIBCXX_DIR BASE_DIRECTORY "${CMAKE_CXX_COMPILER_CLANG_RESOURCE_DIR}" NORMALIZE)
         if(NOT EXISTS "${cpprog_LIBCXX_DIR}")
             message(FATAL_ERROR "[cpprog] libc++ not found at ${cpprog_LIBCXX_DIR}")
         endif()