(protocol-a.info): Don't allow tabs in the document.

doc/Makefile.am

-# $Id: Makefile.am,v 1.4 1998/08/06 21:49:39 ceder Exp $
+# $Id: Makefile.am,v 1.5 1998/08/29 18:28:53 ceder Exp $
 # Copyright (C) 1998  Lysator Academic Computer Association.
 #
 # This file is part of the LysKOM server.
@@ -46,6 +46,9 @@ EXTRA_DIST = ADMINISTRATION misc_items prot-A.txt	\
 # Automake tries to generate this rule automatically, but it fails
 # because of the capital letters in the file name of the source file.
 protocol-a.info: Protocol-A.texi
-	@cd $(srcdir) && rm -f $@ $@-[0-9] $@-[0-9][0-9]
+	@# Mixing tabs and non-tabs may cause the info file to look
+	@# ugly.  Ban tabs.
+	if grep -n '	' $< /dev/null ; then echo tabs detected ; exit 1; fi
+	cd $(srcdir) && rm -f $@ $@-[0-9] $@-[0-9][0-9]
 	cd $(srcdir) \
 	  && $(MAKEINFO) `echo $< | sed 's,.*/,,'`