lynx-dev "make lynx.patch" tweak

[pg]

I notice some correspondence encouraging use of the makefile to
generate patches.  I wrote this using "diff -c" since "diff -u"
is a GNUdism, not covered by the POSIX mantle.  I notice that
it's easy to test at runtime for availability of "diff -u" and
use it.  Patch attached to do this.  (This could even be tested
in the configure script.  I didn't feel inspired to do so.
Editor's choice.  :-)

-- gil
-- 
StorageTek
INFORMATION made POWERFUL
=============================================================================
%%% Created Sat Oct  2 22:38:16 MDT 1999 by target lynx.patch. %%%
diff -bru orig/lynx2-8-3/makefile.in lynx2-8-3/makefile.in
--- orig/lynx2-8-3/makefile.in  Thu Aug 26 05:31:19 1999
+++ lynx2-8-3/makefile.in       Sat Oct  2 22:36:24 1999
@@ -287,7 +287,7 @@
 REFDIR=orig/$(lynxdir)
 
 lynx.patch: $(top_srcdir) $(top_srcdir)/CHANGES
-       cd  $(top_srcdir)/.. && cd $(REFDIR) && { rm -f \
+       - cd $(top_srcdir)/.. && cd $(REFDIR) && { rm -f \
                config.log \
                config.status \
                lynx_cfg.h \
@@ -296,10 +296,12 @@
                        ( set -x; cd $$I && rm -f *.orig *.rej makefile ); : ); 
\
                done; }
        ( cd $(top_srcdir)/..; echo "%%% Created `date` by target 
address@hidden %%%"; \
-                       diff -brc $(REFDIR) $(lynxdir) ) \
+           if diff -bru /dev/null /dev/null;                 \
+                   then diff -bru $(REFDIR) $(lynxdir);      \
+                   else diff -brc $(REFDIR) $(lynxdir); fi ) \
                | grep -v '^Common' \
                | grep -v '^Binary files ' \
-               | grep -v '^Only ' | tee $@ | grep '^--- $(lynxdir)'
+               | grep -v '^Only ' | tee $@ | egrep '^\-\-\- .*$(lynxdir)'
 
 install: install-bin install-man install-cfg @INSTALL_LSS@
        @echo