diff --git a/SConscript b/SConscript
index 29f9f9e..3adc0df 100644
--- a/SConscript
+++ b/SConscript
@@ -172,6 +172,9 @@ default_CXX = {
     'msvc': 'cl.exe'
 }.get(compiler, None)
 
+if not os.path.isabs(config_file):
+    config_file = os.path.join(Dir('#').abspath, config_file)
+
 vars = Variables(config_file)
 vars.Add('CC', 'The C Compiler', default_CC)
 vars.Add('CXX', 'The C++ Compiler', default_CXX)