when gettext is not installed error during make

[Patrice Dumas]

Hello,

By chance, I don't have gettext installed, ./configure proceeds without
complaining much, although it prints

checking whether NLS is requested... yes
checking for msgfmt... no
checking for gmsgfmt... :
checking for xgettext... no
checking for msgmerge... no
checking for CFPreferencesCopyAppValue... no
checking for CFLocaleCopyCurrent... no
checking for GNU gettext in libc... yes
checking whether to use NLS... yes
checking where the gettext function comes from... libc

When I run make, there is an error when the po_document strings need to
be remade because msgmerge is not installed:

make[5]: Leaving directory '/home/dumas/src/texinfo/po_document'
: --update  --lang=ca ca.po texinfo_document.pot
/bin/sh: 1: msgmerge: not found
rm -f ca.gmo && : -c --statistics --verbose -o ca.gmo ca.po
mv: cannot stat 't-ca.gmo': No such file or directory
make[4]: *** [Makefile:190: ca.gmo] Error 1
make[4]: Leaving directory '/home/dumas/src/texinfo/po_document'
make[3]: *** [Makefile:3682: ../po_document/ca.gmo] Error 2
make[3]: Leaving directory '/home/dumas/src/texinfo/tp'
make[2]: *** [Makefile:3229: all-recursive] Error 1
make[2]: Leaving directory '/home/dumas/src/texinfo/tp'
make[1]: *** [Makefile:1218: all-recursive] Error 1
make[1]: Leaving directory '/home/dumas/src/texinfo'
make: *** [Makefile:1155: all] Error 2

It is written in README-hacking that Gettext is used.

It is possible that Gettext is not needed in general when remaking
Texinfo, when starting from the release.  So having configure errors out
if Gettext is not installed is probably not be the best option.  It
could be possible not to change nothing, considering that README-hacking
is clear enough and people hacking on Texinfo can understand msgmerge:
not found error message.  Another option option would be to add a bit more 
text in README-hacking to say something like

  If Gettext is not installed, an error could appear when doing make 
  and not before, as Gettext may not be needed when starting from a 
  release.

What do you think?

-- 
Pat