[bug-gettext] gettext leaking symbols into global namespace

[Dr. Michael Lauer]

Hi,

I’m working on macOS 10.13.x. Since libc on macOS does not have the necessary
gettext functionality, I have compiled gettext as requirement for compiling 
Glib.

When compiling GLib though, I noticed that autotools wrongly believes that my 
platform has pipe2(2).
This is due to gettext leaking this (and probably other symbols from gnu-lib) 
into the global namespace.

Is there any way to prevent this?

Best regards,

Mickey.