diff --git a/gp2c.spec b/gp2c.spec
index 7627df6..5cf3ac5 100644
--- a/gp2c.spec
+++ b/gp2c.spec
@@ -44,7 +44,7 @@ scripts.
 %setup -q
 
 %build
-%configure --docdir="%_docdir/%name"
+%configure --docdir="%_docdir/%name" CFLAGS="%optflags -fcommon"
 make %{?_smp_mflags}
 
 %install