7.18 iconv.h
POSIX specification:
http://www.opengroup.org/onlinepubs/9699919799/basedefs/iconv.h.html
Gnulib module: iconv
Portability problems fixed by Gnulib:
- The <iconv.h> from GNU libiconv is not found if installed in
$PREFIX/include.
Portability problems not fixed by Gnulib:
- This header file is missing on some platforms:
FreeBSD 6.0, OpenBSD 3.8, mingw, BeOS,
when GNU libiconv is not installed.