Sorry for trashing CC list, recovering..

> > It seems that it comes from mailutils (but not mentioned in your patch
> > - not in mailutils)
> 
> Actually it is not.  It comes from one of my projects:
> 
>    https://puszcza.gnu.org.ua/projects/grecs
> 
> and I synchronize it with mailutils from time to time.  In the future I
> plan to include grecs as a submodule to Mailutils, so the duplication
> could be removed in that particular case.
> 
> Wordsplit has been written so that it can be easily incorporated into
> another projects, without the need of pulling any additional
> dependencies.

Isn't that nice candidate for gnulib then?  I feel this is quite useful
piece of code.  But it may be that gnulib project is too careful to
incorporate this..

> > Another problem is that I'm unable to compile the new code with
> >   './configure && make';
> 
> Why? Do you get any errors?

Yes, maybe not complete list of warnings/errors:

  $ cat test.sh
  #!/bin/bash

  WHERE=`mktemp -d`
  pushd $WHERE
  git clone git://git.savannah.gnu.org/tar.git
  cd tar
  ./bootstrap && autoreconf -vfi && ./configure && make -k
  popd

  ========

  [...]
    GEN      ref-del.sed
  In file included from regex.c:72:0:
  regcomp.c: In function ‘rpl_re_set_syntax’:
  regcomp.c:262:1: error: old-style function definition 
[-Werror=old-style-definition]
  regcomp.c: In function ‘rpl_re_compile_fastmap’:
  regcomp.c:275:1: error: old-style function definition 
[-Werror=old-style-definition]
  regcomp.c: In function ‘rpl_regcomp’:
  regcomp.c:475:1: error: old-style function definition 
[-Werror=old-style-definition]
  regcomp.c: In function ‘rpl_regfree’:
  regcomp.c:663:1: error: old-style function definition 
[-Werror=old-style-definition]
  In file included from regex.c:73:0:
  regexec.c: In function ‘rpl_regexec’:
  regexec.c:224:1: error: old-style function definition 
[-Werror=old-style-definition]
  regexec.c: In function ‘rpl_re_match’:
  regexec.c:312:1: error: old-style function definition 
[-Werror=old-style-definition]
  regexec.c: In function ‘rpl_re_search’:
  regexec.c:325:1: error: old-style function definition 
[-Werror=old-style-definition]
  regexec.c: In function ‘rpl_re_match_2’:
  regexec.c:340:1: error: old-style function definition 
[-Werror=old-style-definition]
  regexec.c: In function ‘rpl_re_search_2’:
  regexec.c:354:1: error: old-style function definition 
[-Werror=old-style-definition]
  regexec.c: In function ‘rpl_re_set_registers’:
  regexec.c:586:1: error: old-style function definition 
[-Werror=old-style-definition]
  cc1: all warnings being treated as errors
  make[4]: *** [regex.o] Error 1
  make[4]: Target `all-am' not remade because of errors.
  make[4]: Leaving directory `/tmp/tmp.AHISKP3RET/tar/gnu'
  make[3]: *** [all-recursive] Error 1
  make[3]: Leaving directory `/tmp/tmp.AHISKP3RET/tar/gnu'
  make[2]: *** [all] Error 2
  make[2]: Leaving directory `/tmp/tmp.AHISKP3RET/tar/gnu'
  Making all in lib
  make[2]: Entering directory `/tmp/tmp.AHISKP3RET/tar/lib'
    GEN      rmt-command.h
  make  all-am
  make[3]: Entering directory `/tmp/tmp.AHISKP3RET/tar/lib'
    CC       paxerror.o
  [...]
    CC       xattr-at.o
  wordsplit.c: In function ‘_wsplt_error’:
  wordsplit.c:70:3: error: function might be possible candidate for 
‘gnu_printf’ format attribute [-Werror=missing-format-attribute]
  wordsplit.c: In function ‘expvar’:
  wordsplit.c:708:15: error: variable ‘defstr’ set but not used 
[-Werror=unused-but-set-variable]
  cc1: all warnings being treated as errors
  make[3]: *** [wordsplit.o] Error 1
  make[3]: Target `all-am' not remade because of errors.
  make[3]: Leaving directory `/tmp/tmp.AHISKP3RET/tar/lib'
  make[2]: *** [all] Error 2
  make[2]: Leaving directory `/tmp/tmp.AHISKP3RET/tar/lib'
  Making all in rmt
  make[2]: Entering directory `/tmp/tmp.AHISKP3RET/tar/rmt'
  make[2]: *** No rule to make target `../gnu/libgnu.a', needed by `rmt'.
    CC       rmt.o
  make[2]: Target `all' not remade because of errors.
  make[2]: Leaving directory `/tmp/tmp.AHISKP3RET/tar/rmt'
  Making all in src
  make[2]: Entering directory `/tmp/tmp.AHISKP3RET/tar/src'
    CC       buffer.o
  [...]

Pavel



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