Index: /issm/trunk-jpl/externalpackages/dakota/install-6.2-macosx64.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/dakota/install-6.2-macosx64.sh	(revision 23456)
+++ /issm/trunk-jpl/externalpackages/dakota/install-6.2-macosx64.sh	(revision 23457)
@@ -71,5 +71,5 @@
 export PATH=$DAK_INSTALL/bin:$DAK_INSTALL/test:$PATH
 
-if [ -z $DYLD_LIBRARY_PATH ]
+if [ -z ${DYLD_LIBRARY_PATH+x} ]
 then
 	export DYLD_LIBRARY_PATH=$DAK_INSTALL/lib:$DAK_INSTALL/bin