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.\"O .SH SYNOPSIS
.SH ½ñ¼°
-.B #define _GNU_SOURCE
+.\"O .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
+.BR "#define _GNU_SOURCE" " /* feature_test_macros(7) »²¾È */"
.br
.B #include <stdio.h>
.sp
.SH ´ØÏ¢¹àÌÜ
.BR free (3),
.BR malloc (3),
-.BR printf (3),
-.BR feature_test_macros (7)
+.BR printf (3)