diff --git a/SConscript b/SConscript
index fe98247..18ef171 100644
--- a/SConscript
+++ b/SConscript
@@ -871,6 +871,10 @@ vars.Add('COMPILATIONDB_FILTER_FILES', 'Removes source files from the compilatio
 vars.Add('SHOW_INCLUDES', 'Show include hierarchy (for debugging).', False)
 vars.Add('ENABLE_ASAN', 'Enable address sanitization.', bool(enable_asan))
 
+if 'VARIABLES' in config:
+    for vardef in config['VARIABLES']:
+        vars.Add(*vardef)
+
 tools = ['default', 'compilation_db', 'unity_build']
 if 'TOOLS' in config:
     tools.extend(config['TOOLS'])