@itemize
@item
This function is missing on some platforms:
-mingw.
+mingw, MSVC 9.
+@item
+This function is not declared unless @code{_REENTRANT} is defined,
+on some platforms:
+HP-UX 11.
@item
Some platforms define a function of this name that is incompatible to POSIX:
HP-UX 10.