NetBSD 3.0, mingw, BeOS.
@item
This function has an incompatible declaration on some platforms:
-MacOS X 10.4, Solaris 10 (when @code{_POSIX_PTHREAD_SEMANTICS} is not defined).
+MacOS X 10.4, Solaris 11 2010-11 (when @code{_POSIX_PTHREAD_SEMANTICS} is not defined).
@item
This function refuses to do anything when the output buffer is less than 128
bytes large, on some platforms:
-Solaris 10.
+Solaris 11 2010-11.
@end itemize
Portability problems not fixed by Gnulib: