.\" by Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2008-09-14, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
-.TH ATAN 3 2008-12-02 "" "Linux Programmer's Manual"
+.TH ATAN 3 2010-09-20 "" "Linux Programmer's Manual"
.SH ̾Á°
atan, atanf, atanl \- µÕÀµÀÜ¡Êarc tangent¡Ë´Ø¿ô
.SH ½ñ¼°
.ad l
.BR atanf (),
.BR atanl ():
-_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
.SH ÀâÌÀ
.BR atan ()