DEF="-DUNIX"

if test -f "/usr/include/stdlib.h"
then
	DEF="$DEF -D_HAVE_STDLIB_H_"
fi
if test -f "/usr/include/string.h"
then
	DEF="$DEF -D_HAVE_STRING_H_"
fi
if test -f "/usr/include/unistd.h"
then
	DEF="$DEF -D_HAVE_UNISTD_H_"
fi

echo $DEF