I added Mesa to the rztrona config site file.
@@ -55,6 +55,11 @@ VISIT_OPTION_DEFAULT(VISIT_DDT ON TYPE BOOL)
##############################################################
##
+##
+## Mesa
+##
+VISIT_OPTION_DEFAULT(VISIT_MESA_DIR ${VISITHOME}/mesa/7.10.2/${VISITARCH})
+
##
## Python
##
