info.nr/%: info/%.t
- (cd $(srcdir)/info && $(NROFF) CRT.MAC $(notdir $< )) | $(AWK) -f $(filter %/Blank.awk, $^) >$@
+ $(NROFF) $(filter %.MAC, $^) $< | $(AWK) -f $(filter %/Blank.awk, $^) >$@
+# Pipes in make are a pain. Catch obvious errors:
+ @test -s $@
info.html/%.html: info/%.t
perl $(filter %.pl, $^) $< >$@