@section @code{ceilf}
@findex ceilf
-POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/ceilf.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/ceilf.html}
-Gnulib module: ceilf
+Gnulib module: ceilf or ceilf-ieee
-Portability problems fixed by Gnulib:
+Portability problems fixed by either Gnulib module @code{ceilf} or @code{ceilf-ieee}:
@itemize
@item
This function is missing on some platforms:
-AIX 5.1, HP-UX 11, Solaris 9.
+Minix 3.1.8, AIX 5.1, HP-UX 11, Solaris 9.
+@end itemize
+
+Portability problems fixed by Gnulib module @code{ceilf-ieee}:
+@itemize
+@item
+This function returns a positive zero for an argument between -1 and 0
+on some platforms:
+MacOS X 10.5, AIX 7.1, OSF/1 5.1.
+@item
+This function returns a positive zero for a minus zero argument
+on some platforms:
+OSF/1 5.1.
@end itemize
Portability problems not fixed by Gnulib: