+.ad l
+.RS 4
+.PD 0
+.TP 4
+.\"O Since glibc 2.12:
+glibc 2.12 °Ê¹ß:
+.nf
+_BSD_SOURCE ||
+ (_XOPEN_SOURCE\ >=\ 500 ||
+ _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED) &&
+ !(_POSIX_C_SOURCE\ >=\ 200809L || _XOPEN_SOURCE\ >=\ 700)
+.TP 4
+.fi
+.\"O Before glibc 2.12:
+glibc 2.12 ¤è¤êÁ°:
+_BSD_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
+_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
+.PD
+.RE
+.ad b