diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -291,6 +291,29 @@
 	endif()
 endif()
 
+check_cxx_source_compiles("
+    #include <filesystem>
+    namespace fs = std::filesystem;
+    int main() {
+        (void)fs::current_path().root_name();
+        return 0;
+    }
+" HAVE_STD_FILESYSTEM)
+
+if(!HAVE_STD_FILESYSTEM)
+	include(CheckCXXCompilerFlag)
+	CHECK_CXX_COMPILER_FLAG(-lstdc++fs ${REQUIRES_STDCXXFS})
+    if(!REQUIRES_STDCXXFS)
+	    CHECK_CXX_COMPILER_FLAG(-lc++fs ${REQUIRES_CXXFS})
+        if(!REQUIRES_CXXFS)
+            message(FATAL_ERROR "cannot figure out how to use std::filesystem")
+		else()
+            link_libraries(c++fs)
+        endif()
+	else()
+        link_libraries(stdc++fs)
+    endif()
+endif()
 
 # Make sure that all the global compiler and linker flags are set BEFORE
 # including the libraries so they apply as needed.