On 1/18/20 5:46 AM, Bruno Haible wrote:

> This code in Emacs configure.ac:
> 
> # Use the system putenv even if it lacks GNU features, as we don't need them,
> # and the gnulib replacement runs afoul of a FreeBSD 10.1 bug; see Bug#19874.
> AC_CHECK_FUNCS_ONCE([putenv])
> AC_DEFUN([gl_FUNC_PUTENV],
>    [test "$ac_cv_func_putenv" = yes || REPLACE_PUTENV=1])
> 
> appears to be extra convoluted. All platforms have the putenv function.
> Therefore REPLACE_PUTENV=1 is never executed here. If Emacs does not need
> the putenv override, the simpler way is to invoke gnulib-tool with
> '--avoid=putenv'.

Thanks for suggesting that. I installed the attached patch to Emacs master to 
implement something along the lines you suggested. I am cc'ing Ashish Shukla who 
reported Bug#19874 ("25.0.50; encode-time not working as expected"), as well as 
Wolfgang Jenkner who helped debug that, to give them a heads-up that the fix for 
Bug#19874 has changed.