POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/trunc.html}
-Gnulib module: trunc
+Gnulib module: trunc or trunc-ieee
-Portability problems fixed by Gnulib:
+Portability problems fixed by either Gnulib module @code{trunc} or @code{trunc-ieee}:
@itemize
@item
This function is missing on some platforms:
glibc 2.8.
@end itemize
+Portability problems fixed by Gnulib module @code{trunc-ieee}:
+@itemize
+@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:
@itemize
@end itemize