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* Makefile.in (DOS_gnulib_comp.m4): Renamed from DOS-gnulib-comp.m4,
for portability to POSIX make.  Reported by Bruno Haible.
(sync-from-gnulib): Copy gl-comp.m4 (if present) back to
gnulib-comp.m4 before running gnulib-tool, to prevent old gnulib
files from accumulating as garbage.  Also reported by Bruno Haible.