diff --git a/Tools/GAMS/build b/Tools/GAMS/build
index 595506c..e637c52 100755
--- a/Tools/GAMS/build
+++ b/Tools/GAMS/build
@@ -16,3 +16,7 @@ pbuild::install() {
 	:
 }
 
+pbuild::post_install() {
+	:
+}
+
diff --git a/Tools/GAMS/files/config.yaml b/Tools/GAMS/files/config.yaml
index c38ccba..aff00b6 100644
--- a/Tools/GAMS/files/config.yaml
+++ b/Tools/GAMS/files/config.yaml
@@ -8,20 +8,16 @@ GAMS:
     50.3.0:
       variants:
         - relstage: stable
-          overlay: merlin
-          use_overlays: [PSI]
+          overlay: base
     42.3.0:
       variants:
         - relstage: stable
-          overlay: merlin
-          use_overlays: [PSI]
+          overlay: base
     31.1.1:
       variants:
         - relstage: deprecated
-          overlay: merlin
-          use_overlays: [PSI]
+          overlay: base
     30.3.0:
       variants:
         - relstage: deprecated 
-          overlay: merlin
-          use_overlays: [PSI]
+          overlay: base