@itemize
@item
This function is missing on some platforms:
-AIX 5.1, HP-UX 11.23, 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 removes only the first value association for the given
environment variable, not all of them, on some platforms:
-Solaris 11 2010-11.
+Solaris 11 2010-11, Haiku.
@end itemize
Portability problems not fixed by Gnulib: