@itemize
@item
This function is missing on some platforms:
-AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 9, mingw, BeOS.
+AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, mingw, MSVC 9, BeOS.
+@item
+This function is not declared on some platforms:
+OSF/1 5.1.
@item
This function has the return type @samp{void} instead of @samp{int} on some
platforms:
-MacOS X 10.3, FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8, OSF/1 5.1.
+Mac OS X 10.3, FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8, OSF/1 5.1.
@item
On some platforms, this function does not fail with @samp{EINVAL} when
passed an empty string or a string containing @samp{=}:
@item
This function removes only the first value association for the given
environment variable, not all of them, on some platforms:
-Solaris 10.
+Solaris 11 2011-11, Haiku.
@end itemize
Portability problems not fixed by Gnulib: