From: Eric Backus <ericb AT lsid DOT hp DOT com>
Subject: Re: looking for objects...
To: baclofen AT nencki DOT gov DOT pl
Date: Mon, 21 Jun 93 10:51:55 PDT
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Mailer: Elm [revision: 66.25]

>  I have just started to use djgpp (hours..). There appeared some troubles 
> while making makefile :
> 
> ****** makefile for Sun GNU **********
> 
> 
> OBJECTS = clustalv.o amenu.o myers.o sequence.o showpair.o \
>           upgma.o util.o trees.o gcgcheck.o
> 
> SOURCES = clustalv.c amenu.c myers.c sequence.c showpair.c \
>           upgma.c util.c trees.c gcgcheck.c
> 
> HEADERS = general.h clustalv.h
> 
> CFLAGS  = -c
> 
> clustalv : $(OBJECTS)
>  gcc -o $@ $(OBJECTS) -lm
> 
> clustalv.o : clustalv.c $(HEADERS) matrices.h
>  gcc $(CFLAGS) clustalv.c
> 
> .c.o : $(SOURCES)
>  gcc $(CFLAGS) $?
> !!!!!!!!
> ********* end of makefile ***********
>
> ----------------------------------------------------------------------
> Marcin Gierdalski

It is difficult for me to tell exactly what went wrong.  I will assume
that you are using DJGPP and GNUish make on MSDOS.  If that is true,
you are probably running into one of the limitations of GNUish make.

For reasons known to but a few, GNUish make does not recognise that
".o" is a valid suffix.  You must do two things to fix this.  First,
you must supply a ".c.o" default rule so that GNUish make knows how to
make a ".o" file from a ".c" file.  It appears that your makefile
already does this.  But in addition, you must tell GNUish make that
".o" is indeed a valid suffix, by adding a line that looks like:

.SUFFIXES:	.o

If you are using GNUish make, this should fix your problem.
--
				Eric Backus
				ericb AT lsid DOT hp DOT com
				(206) 335-2495