run cleanup script only on final uninstall

epics-base.spec

@@ -259,6 +259,7 @@ then
 fi
 
 %postun
+[ "$1" -eq 0 ] || exit
 shopt -s extglob
 %{__rm} -f /etc/profile.d/epics-base.sh
 %{__ln_s} "$(/usr/bin/ls -dvr1 /usr/local/epics/base-+([0-9]).+([0-9]).+([0-9])/bin/epics-base.sh 2>/dev/null | /usr/bin/head -n1)" /etc/profile.d/ 2>/dev/null