+## Test scripts must be executable.
+sc_tests_executable:
+ @st=0; \
+ for f in $(xtests); do \
+ case $$f in \
+ t/ax/*|./t/ax/*|$(srcdir)/t/ax/*);; \
+ *) test -x $$f || { echo "$$f: not executable" >&2; st=1; }; \
+ esac; \
+ done; \
+ test $$st -eq 0 || echo '$@: some test scripts are not executable' >&2; \
+ exit $$st;
+
+