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	users to set.
	* Makefile.in (CFLAGS): Let configure determine the default value
	for this.  Don't
	have it default to DEFS.
	(${SUBDIR}): Pass CFLAGS down to submakes, not DEFS.
	(lib-src/Makefile, src/Makefile): Edit the default value for
	CFLAGS into these files, not DEFS.
	* configure.in (CFLAGS): Choose a default value for this - "-g"
	normally, or "-g -O" if we're using GCC.  Edit it into the
	top-level Makefile.

	* configure.in: When scanning the machine and system description
	#include files, write their names to conftest.c properly.

	* configure.in: In configuration name case for Apallos running
	Domainios, set opsys, not opsysfile.

	* configure.in: Use the autoconf AC_CONFIG_HEADER macro to produce
	src/config.h, instead of AC_OUTPUT; the latter overwrites
	src/config.h even when it hasn't changed, puts a makefile-style
	comment at the top even though it's C code, and produces a
	config.status script which doesn't do the job right.

	* configure.in: Add AC_LN_S test, so we can tell whether or not we
	can use a symbolic link to get the X Menu library into src.
	* Makefile.in (LN_S): New variable.
	(src/Makefile): Edit the value of LN_S into this makefile.