[bug #61315] Several groff source files don't include <config.h> first

[Paul Eggert]

Follow-up Comment #3, bug #61315 (project groff):

The fix for ticket #59276 does not suffice for current Gnulib. 

The proposed patch causes Groff to include <config.h> before including any
file supplied by the system. This suffices to make Groff robust for both
current and future Gnulib, and it is nearly equivalent to Ingo's suggestion to
"include config.h everywhere no matter whether it is needed or not". (I write
"nearly equivalent" because the proposed patch does not affect
src/utils/addftinfo/guess.cpp even though Ingo's suggestion would alter that
file.)

Gnulib keeps evolving mostly because POSIX, C, C++, glibc, etc. keep evolving.
The Groff source can of course handle this sort of evolution on its own. My
suggestion, though, is to take advantage of Gnulib when this saves you work
overall, even if there are minor glitches such as the one embodied in the
proposed patch.

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