--- a/html2ps
+++ b/html2ps
@@ -354,8 +354,8 @@
 
 EOR
 
-eval "require POSIX";
-$posix = !$@;
+use POSIX;
+$posix = 1;
 
 %extend=('quote',1, 'font',1, 'colour',1, 'hyphenation',1);
 %fal=("serif","times", "sans_serif","helvetica", "monospace","courier");
@@ -496,6 +496,8 @@
 die "Ghostscript is required to generate cross references\n"
  if($opt_R && !$package{'Ghostscript'});
 $tmpname=$posix?POSIX::tmpnam():"h2p_$$";
+sysopen TMP, $tmpname, O_RDWR|O_CREAT|O_EXCL, 0600 or die "$!";
+close TMP;
 ($scr=$tmpname)=~/\w+$/;
 $tempdir=$`;