Don't override environment already specified

diff --git a/org.glite.security.proxyrenewal/config/startup b/org.glite.security.proxyrenewal/config/startup
index 6fe303b..ff13d2d 100755 (executable)
--- a/org.glite.security.proxyrenewal/config/startup
+++ b/org.glite.security.proxyrenewal/config/startup
@@ -1,8 +1,8 @@
 #!/bin/sh
 
-GLITE_LOCATION=/opt/glite
-GLITE_USER=glite
-GLITE_LOCATION_VAR=/opt/glite/var
+GLITE_LOCATION=${GLITE_LOCATION:-/opt/glite}
+GLITE_USER=${GLITE_USER:-glite}
+GLITE_LOCATION_VAR=$(GLITE_LOCATION_VAR:-/opt/glite/var}
 
 [ -f /etc/glite.conf ] && . /etc/glite.conf
 [ -f $HOME/.glite.conf ] && . $HOME/.glite.conf