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diff --git a/ext/POSIX/POSIX.pod b/ext/POSIX/POSIX.pod
index 124d0bd..7263d0a 100644
--- a/ext/POSIX/POSIX.pod
+++ b/ext/POSIX/POSIX.pod
@@ -125,8 +125,8 @@ and it is called thusly
 			   $wday, $yday, $isdst);
 
 The C<$mon> is zero-based: January equals C<0>.  The C<$year> is
-1900-based: 2001 equals C<101>.  The C<$wday>, C<$yday>, and C<$isdst>
-default to zero (and the first two are usually ignored anyway).
+1900-based: 2001 equals C<101>.  C<$wday> and C<$yday> default to zero
+(and are usually ignored anyway), and C<$isdst> defaults to -1.
 
 =item asin
 
@@ -857,7 +857,7 @@ Convert date/time info to a calendar time.
 
 Synopsis:
 
-	mktime(sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = 0)
+	mktime(sec, min, hour, mday, mon, year, wday = 0, yday = 0, isdst = -1)
 
 The month (C<mon>), weekday (C<wday>), and yearday (C<yday>) begin at zero.
 I.e. January is 0, not 1; Sunday is 0, not 1; January 1st is 0, not 1.  The
@@ -1055,7 +1055,7 @@ see L<perlre>.
 
 Sets the real group identifier and the effective group identifier for
 this process.  Similar to assigning a value to the Perl's builtin
-C<$)> variable, see L<perlvar/$GID>, except that the latter
+C<$)> variable, see L<perlvar/$EGID>, except that the latter
 will change only the real user identifier, and that the setgid()
 uses only a single numeric argument, as opposed to a space-separated
 list of numbers.
@@ -1648,7 +1648,7 @@ calling C<POSIX::open>.
 
 	$fd = POSIX::open( "foo", &POSIX::O_WRONLY );
 	$buf = "hello";
-	$bytes = POSIX::write( $b, $buf, 5 );
+	$bytes = POSIX::write( $fd, $buf, 5 );
 
 Returns C<undef> on failure.
 
@@ -1732,13 +1732,13 @@ Setting the %SIGRT elements is equivalent to calling this:
 
   sub new {
     my ($rtsig, $handler, $flags) = @_;
-    my $sigset = POSIX:SigSet($rtsig);
+    my $sigset = POSIX::SigSet($rtsig);
     my $sigact = POSIX::SigAction->new($handler, $sigset, $flags);
     sigaction($rtsig, $sigact);
   }
 
 The flags default to zero, if you want something different you can
-either use C<local> on $POSIX::RtSig::SIGACTION_FLAGS, or you can
+either use C<local> on $POSIX::SigRt::SIGACTION_FLAGS, or you can
 derive from POSIX::SigRt and define your own C<new()> (the tied hash
 STORE method of the %SIGRT calls C<new($rtsig, $handler, $SIGACTION_FLAGS)>,
 where the $rtsig ranges from zero to SIGRTMAX - SIGRTMIN + 1).