.\" by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2008-09-14, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
-.TH ACOS 3 2008-08-05 "" "Linux Programmer's Manual"
+.TH ACOS 3 2010-09-20 "" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O acos, acosf, acosl \- arc cosine function
.ad l
.BR acosf (),
.BR acosl ():
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
+.RS 4
+_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
+_POSIX_C_SOURCE\ >=\ 200112L;
+.br
+or
.I cc\ -std=c99
+.RE
.ad b
.\"O .SH DESCRIPTION
.SH ÀâÌÀ