[Bug 94231] Problems compiling libdrm since glibc 2.23

https://bugs.freedesktop.org/show_bug.cgi?id=94231

--- Comment #4 from Daniel Stone daniel@fooishbar.org --- (In reply to Emil Velikov from comment #3)

I.e. if the _BSD_SOURCE define does not help, then either glibc needs to be fixed or the manuals should be updated (the glibc fold might have some suggestions) ?

_BSD_SOURCE gets defined if you call AC_USE_SYSTEM_EXTENSIONS from configure.ac, which gives you the maximal set of defines. It's not safe to just define the _*_SOURCE macros, since whilst glibc etc treat them as additive, BSD libcs treat them as restrictive (e.g. defining _BSD_SOURCE gives you a pure BSD environment without some of the features enabled by, e.g., _XOPEN_SOURCE).