Added FTM to prototype

diff --git a/man3/ualarm.3 b/man3/ualarm.3
index 9dfd4b1b5bfcc0b59b6dcc8f90bff2cd3668c85e..681cbda24780980de55e68a01cf8044e565be28f 100644 (file)
--- a/man3/ualarm.3
+++ b/man3/ualarm.3
@@ -25,6 +25,7 @@
 ualarm \- schedule signal after given number of microseconds
 .SH SYNOPSIS
 .nf
+.B "#define _XOPEN_SOURCE 500     /* Or: #define _BSD_SOURCE */
 .B "#include <unistd.h>"
 .sp
 .BI "useconds_t ualarm(useconds_t " usecs ", useconds_t " interval );