814c4ebf400aaa7423f2e908983763d418747912
--- a/configure.ac
+++ b/configure.ac
@@ -95,7 +95,7 @@ AC_ARG_ENABLE([tests],
 
 AM_CONDITIONAL([ENABLE_TESTS], test "$enable_tests" = yes)
 AM_CONDITIONAL([HAVE_CHECK], test "$HAVE_CHECK" = yes)
-AM_CONDITIONAL([PACKAGE_URL], "$PACKAGE_URL")
+AM_CONDITIONAL([PACKAGE_URL], test -n "$PACKAGE_URL")
 
 #---------------------------------------------------------------------
 # Other checks