diff --git a/config/CONFIG_SITE.sun4 b/config/CONFIG_SITE.sun4
index f9894615a..63a385da8 100644
--- a/config/CONFIG_SITE.sun4
+++ b/config/CONFIG_SITE.sun4
@@ -24,7 +24,7 @@ CXXCMPLR=NORMAL
 #STANDARD=GCC
 #CPLUSPLUS=G++
 #Note: if CPLUSPLUS is empty then C++ src codes are not built
-CPLUSPLUS=
+#CPLUSPLUS=
 
 # Special C library requirements
 #SPECIAL_LANG = /usr/lang/SC3.0.1