diff --git a/monobristol.spec b/monobristol.spec
index 8bece8c..e1a0e5c 100644
--- a/monobristol.spec
+++ b/monobristol.spec
@@ -32,6 +32,10 @@ synthesizers including additive and subtractive and a few organs.
 %setup -q
 %patch1 -p1
 
+sed -i "s#gmcs#mcs#g" configure*
+sed -i "s#gmcs#mcs#g" Makefile.in
+sed -i "s#gmcs#mcs#g" monoBristol.make
+
 %build
 %configure
 # not parallel safe