@if test -e '$(srcdir)'/.git && (git --version) >/dev/null 2>&1 && \
grep -n -f '$(srcdir)'/build-aux/thread-safety-blacklist \
`git ls-files '$(srcdir)' | grep '\.[ch]$$' \
- | $(EGREP) -v '^datapath|^lib/sflow|^third-party'` \
+ | $(EGREP) -v '^datapath|^lib/sflow|^third-party'` /dev/null \
| $(EGREP) -v ':[ ]*/?\*'; \
then \
echo "See above for list of calls to functions that are"; \