HTMLDOC Problem:

Htmldoc produced no pdf-output.
Commandline:
typo3conf/ext/htmldoc_linux/bin/htmldoc --datadir typo3conf/ext/htmldoc_linux/share/htmldoc -t pdf13  --webpage -f /var/www/vhosts/strennberger.at/httpdocs/typo3temp/hd_1AvV6I - 2>/var/www/vhosts/strennberger.at/httpdocs/typo3temp/se_TpJEkR

This is the stderr output of the htmldoc command without the htmldoc_append parameters:
If you see no errors here please check your htmldoc_append parameters too.
typo3conf/ext/htmldoc_linux/bin/htmldoc: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory

These are the first 80 chars of the output of the htmldoc command. Regularily this should begin with %PDF:

This is the html-data passed to htmldoc:
<!DOCTYPE html
	PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<!-- FOOTER RIGHT "$PAGE" -->
<!-- FOOTER CENTER "" -->
<!-- FOOTER LEFT "" -->
<!-- HEADER RIGHT "" -->
<!-- HEADER CENTER "$TITLE" -->
<!-- HEADER LEFT "" -->
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

<!-- 
	This website is brought to you by TYPO3 - get.content.right
	TYPO3 is a free open source Content Management Framework created by Kasper Skaarhoj and licensed under GNU/GPL.
	TYPO3 is copyright 1998-2005 of Kasper Skaarhoj. Extensions are copyright of their respective owners.
	Information and contribution at http://www.typo3.com
-->

	<style type="text/css">
		/*<![CDATA[*/
	<!--
	/* default styles for extension "tx_slideshow_pi1" */
		.tx-slideshow-pi1 {
			text-align: center;
		}
/* default styles for extension "tx_flvplayer_pi1" */
		.tx-flvplayer-pi1 {
			text-align: center;
		}
	-->
		/*]]>*/
	</style>
	<title>strennberger.at: Home</title>
	<meta name="generator" content="TYPO3 3.8 CMS" />
	<script type="text/javascript">
		/*<![CDATA[*/
	<!--
		browserName = navigator.appName;
		browserVer = parseInt(navigator.appVersion);
		var msie4 = (browserName == "Microsoft Internet Explorer" && browserVer >= 4);
		if ((browserName == "Netscape" && browserVer >= 3) || msie4 || browserName=="Konqueror" || browserName=="Opera") {version = "n3";} else {version = "n2";}
			// Blurring links:
		function blurLink(theObject)	{	//
			if (msie4)	{theObject.blur();}
		}
		
	// -->
		/*]]>*/
	</script>
<script src="typo3conf/ext/yejj_swfobject/js/swfobject.js" type="text/javascript"><!-- //--></script>
<script type="text/javascript">
swfobject.registerObject("yejjFlashContent_1936f97040", "");
</script>


</head>
<body bgcolor="#FFFFFF">

	<!--  CONTENT ELEMENT, uid:806/list [begin] -->
		<a name="806"></a>
		<!--  Plugin inserted: [begin] -->
			
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="590" height="465" id="yejjFlashContent_1936f97040" name="Stein-Schrift" align="right">
<param name="movie" value="uploads/tx_yejjswfobject/stein_schrift_01.swf" />
<param name="bgcolor" value="white" />
<param name="quality" value="high" />
<param name="menu" value="false" />
<param name="base" value="http://strennberger.at/" />
<!--[if !IE]>-->
<object type="application/x-shockwave-flash" data="uploads/tx_yejjswfobject/stein_schrift_01.swf" width="590" height="465" align="right">
<param name="bgcolor" value="white" />
<param name="quality" value="high" />
<param name="menu" value="false" />
<param name="base" value="http://strennberger.at/" />
<!--<![endif]-->
<div class="tx-yejjswfobject-pi1-swf_altcontent" id="flash_1936f97040"></div>
<!--[if !IE]>-->
</object>
<!--<![endif]-->
</object>

		<!--  Plugin inserted: [end] -->
			
	<!--  CONTENT ELEMENT, uid:806/list [end] -->
		
	<!--  CONTENT ELEMENT, uid:1191/image [begin] -->
		<a name="1191"></a>
		<!--  Image block: [begin] -->
			<img src="clear.gif" width="1" height="6" border="0" class="spacer-gif" alt="" title="" /><br /><div style="text-align:center;"><table width="600" border="0" cellspacing="0" cellpadding="0" style="margin-left: auto; margin-right: auto" class="imgtext-table"><tr><td colspan="1"><img src="clear.gif" width="600" height="1" alt="" /></td></tr><tr><td valign="top"><img src="typo3temp/pics/81b9aaaa99.jpg" width="600" height="190" border="0" align="top" alt="" title="" /><br /></td></tr></table></div>
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:1191/image [end] -->
		
	<!--  CONTENT ELEMENT, uid:1192/image [begin] -->
		<a name="1192"></a>
		<!--  Image block: [begin] -->
			<img src="clear.gif" width="1" height="6" border="0" class="spacer-gif" alt="" title="" /><br /><div style="text-align:center;"><table width="600" border="0" cellspacing="0" cellpadding="0" style="margin-left: auto; margin-right: auto" class="imgtext-table"><tr><td colspan="1"><img src="clear.gif" width="600" height="1" alt="" /></td></tr><tr><td valign="top"><img src="typo3temp/pics/dd1fa488d8.jpg" width="600" height="75" border="0" align="top" alt="" title="" /><br /></td></tr></table></div>
		<!--  Image block: [end] -->
			
	<!--  CONTENT ELEMENT, uid:1192/image [end] -->
		
</body>
</html>