.\" Formatted or processed versions of this manual, if unaccompanied by
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-.TH FLOOR 3 2008-10-06 "" "Linux Programmer's Manual"
+.TH FLOOR 3 2010-09-20 "" "Linux Programmer's Manual"
.SH NAME
floor, floorf, floorl \- largest integral value not greater than argument
.SH SYNOPSIS
.ad l
.BR floorf (),
.BR floorl ():
-_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
-.ad b
+.RE
+.ad
.SH DESCRIPTION
These functions return the largest integral value that is not greater than
.IR x .