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diff --git a/man3/scalb.3 b/man3/scalb.3
index 978fd9cd06..f0776b15f6 100644
--- a/man3/scalb.3
+++ b/man3/scalb.3
@@ -20,7 +20,7 @@
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
-.TH SCALB 3 2004-10-31 "" "Linux Programmer's Manual"
+.TH SCALB 3 2007-07-26 "" "Linux Programmer's Manual"
.SH NAME
scalb, scalbf, scalbl, scalbn, scalbnf, scalbnl, scalbln, scalblnf, scalblnl \-
multiply floating-point number by integral power of radix
@@ -46,6 +46,30 @@ multiply floating-point number by integral power of radix
.BI "long double scalblnl(long double " x ", long int " exp );
.sp
Link with \fI-lm\fP.
+.sp
+.in -4n
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.in
+.sp
+.ad l
+.BR scalb (),
+.BR scalbf (),
+.BR scalbl ():
+_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500
+.br
+.BR scalbn (),
+.BR scalbnf (),
+.BR scalbnl ():
+_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
+.I cc\ -std=c99
+.br
+.BR scalbln (),
+.BR scalblnf (),
+.BR scalblnl ():
+_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
+.I cc\ -std=c99
+.ad b
.SH DESCRIPTION
These functions multiply their first argument
.I x