* Shell script functions

#!/bin/sh

testheader ()
{
    h=$1
    r=`echo $1 | sed 's:[/\.]:_:g' | tr 'a-z' 'A-Z'`
    echo
    echo "Checking for header $h..."
    if test -f /usr/include/$h
    then
	echo "Header $h found."
	echo "#define HAVE_$r 1"
	
    else
	echo "Header $h not found."
	echo "/* #undef HAVE_$r */"
    fi
}

testheader sys/time.h
testheader time.h
testheader timer.h

##############################################################################
* Makefiles

building s/w in different directories
	but sharing the source tree

VPATH in makefiles

use Makefile.tmpl
use sed to autogen the Makefile
ranlib encoded in makefiles

* Separate build vs. source directories

separate sources: 3-way merge problems

same dir for binaries: execute diff arch fails