[Bug 192365] x11-toolkits/py-wxPython30 build fails

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192365

--- Comment #6 from Jilles Tjoelker <jilles at FreeBSD.org> ---
It looks like this port is trying to customize the visibility of things in
headers in an unsupported way, by requesting a standard-compliant environment
(such as by defining _POSIX_SOURCE, _POSIX_C_SOURCE or _XOPEN_SOURCE) and
manually defining __BSD_VISIBLE in addition to that.

Because functions like wcscasecmp() and strnlen() were only added in
POSIX.1-2008, they are not exposed if a strict POSIX.1-2001 environment is
requested. The effect of a manual __BSD_VISIBLE on this is undefined, and is in
practice likely to change when a formerly non-standard extension becomes
standard.

For most applications, the default environment is appropriate. It shows
everything except a few things like getline(), which can be enabled with
specific defines.

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