AC_DEFUN([CHECK_OS_OPTIONS], [

CFLAGS="$CFLAGS -Wall -std=gnu99 -fno-strict-aliasing"

case $host_os in
	*darwin*)
		HOST_OS=darwin
		AC_DEFINE(SETEUID_BREAKS_SETUID,[],[setuid after seteuid does not work])
		AC_DEFINE(BROKEN_SETREUID,[], [Broken setreuid])
		AC_DEFINE(BROKEN_SETREGID,[], [Broken setregid])
		AC_DEFINE(YYSTYPE_IS_DECLARED,[], [Broken bison])
		AC_DEFINE([SPT_TYPE], [SPT_REUSEARGV])
		;;
	*freebsd*)
		HOST_OS=freebsd
		AC_SUBST([PROG_LDADD], ['-lthr'])
		;;
	*linux*)
		HOST_OS=linux
		CFLAGS="$CFLAGS -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_GNU_SOURCE"
		AC_DEFINE([SPT_TYPE], [SPT_REUSEARGV])
		;;
	*netbsd*)
		HOST_OS=netbsd
		;;
	*openbsd*)
		HOST_OS=openbsd
		AC_DEFINE([HAVE_ATTRIBUTE__BOUNDED__], [1], [OpenBSD has __bounded__])
		AC_DEFINE([HAVE_ATTRIBUTE__DEAD], [1], [OpenBSD has __dead])
		;;
	*solaris*)
		HOST_OS=solaris
		CFLAGS="$CFLAGS -D__EXTENSIONS__ -D_XOPEN_SOURCE=600 -DBSD_COMP"
		AC_SUBST([PLATFORM_LDADD], ['-lnsl -lsocket'])
		;;
	*) ;;
esac

AM_CONDITIONAL([HOST_DARWIN],  [test x$HOST_OS = xdarwin])
AM_CONDITIONAL([HOST_FREEBSD], [test x$HOST_OS = xfreebsd])
AM_CONDITIONAL([HOST_LINUX],   [test x$HOST_OS = xlinux])
AM_CONDITIONAL([HOST_NETBSD],  [test x$HOST_OS = xnetbsd])
AM_CONDITIONAL([HOST_OPENBSD],  [test x$HOST_OS = xopenbsd])
AM_CONDITIONAL([HOST_SOLARIS], [test x$HOST_OS = xsolaris])
])