automake: use $(MKHELP) variable instead if constant mkhelp.pl

this improves symmetry with the rule above

diff --git a/src/Makefile.am b/src/Makefile.am
index 9c20e34452b0c0d8de968da927c878b1ed8c8176..7b4835953dcedfbda94dcf361bafdb0fbe0db167 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -116,7 +116,7 @@ $(HUGE): $(MANPAGE) $(README) $(MKHELP)
        echo '#endif /* HAVE_LIBZ */' >> $(HUGE)
 else # HAVE_LIBZ
 # This generates the tool_hugehelp.c file uncompressed only
-$(HUGE): $(MANPAGE) $(README) mkhelp.pl
+$(HUGE): $(MANPAGE) $(README) $(MKHELP)
        echo '#include "tool_setup.h"' > $(HUGE)
        $(NROFF) $(MANPAGE) | $(PERL) $(MKHELP) $(README) >> $(HUGE)
 endif