* config.bat [HAVE_X11]: Run sed3x.inp on lib-src/Makefile.
* src/Makefile.in (LIBS_SYSTEM) [MSDOS]: Do not reset.
* src/s/msdos.h (MSDOS_LIBS_SYSTEM): Remove.
* msdos/sed1x.inp (LIBS_SYSTEM): Edit to -lxext -lsys.
* msdos/sed3x.inp: New file.
* lib-src/Makefile.in (LIBS_SYSTEM) [MSDOS]: Do not reset.
(config.h) [MSDOS]: Do not include.