5
POSIX specification: @url{http://www.opengroup.org/susv3xsh/lround.html}
9
Portability problems fixed by Gnulib:
13
Portability problems not fixed by Gnulib:
16
This function is missing on some platforms:
17
FreeBSD 5.2.1, OpenBSD 3.8, AIX 5.1, IRIX 6.5, OSF/1 4.0, Solaris 9, Interix 3.5.