(thus, a cast is required),
defined in
.I <sys/msg.h>
-if the _GNU_SOURCE feature test macro is defined:
+if the
+.BR _GNU_SOURCE
+feature test macro is defined:
.nf
.in +2n
and have become longs under Linux 2.4.
To take advantage of this,
a recompilation under glibc-2.1.91 or later should suffice.
-(The kernel distinguishes old and new calls by an IPC_64 flag in
+(The kernel distinguishes old and new calls by an
+.BR IPC_64
+flag in
.IR cmd .)
.SH "SEE ALSO"
.BR msgget (2),