diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 10bb2f1..54757c3 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -132,3 +132,6 @@ Norman Thiel
 
 vel_tins
   for reporting that externremux x264 uses value of ABR for VBR
+
+Matthias Prill
+  for reporting a compiler error with older libstdc++ versions
diff --git a/HISTORY b/HISTORY
index ad4f134..7624838 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,6 +1,8 @@
 VDR Plugin 'streamdev' Revision History
 ---------------------------------------
 
+- don't use std::map.at(). It's not available in older libstdc++ version
+  (reported by Matthias Prill)
 - fixed extremux x264 using value of ABR for VBR (thanks to vel_tins@vdrportal)
 
 2010-07-20: Version 0.4.0b
diff --git a/remux/extern.c b/remux/extern.c
index ce76883..d66dc0a 100644
--- a/remux/extern.c
+++ b/remux/extern.c
@@ -151,7 +151,10 @@ cTSExt::cTSExt(cRingBufferLinear *ResultBuffer, const cServerConnection *Connect
 
 			// look for section parameters: /path;param1=value1;param2=value2/
 			std::string::size_type begin, end;
-			std::string path = Connection->Headers().at("PATH_INFO");
+			const static std::string PATH_INFO("PATH_INFO");
+
+			tStrStrMap::const_iterator it_pathinfo = Connection->Headers().find(PATH_INFO);
+			const std::string& path = it_pathinfo == Connection->Headers().end() ? "/" : it_pathinfo->second;
 			begin = path.find(';', 0);
 			begin = path.find_first_not_of(';', begin);
 			end = path.find_first_of(";/", begin);
diff --git a/server/connectionHTTP.c b/server/connectionHTTP.c
index 7e9766c..72a72c0 100644
--- a/server/connectionHTTP.c
+++ b/server/connectionHTTP.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: connectionHTTP.c,v 1.13.2.4 2010/07/20 12:26:10 schmirl Exp $
+ *  $Id: connectionHTTP.c,v 1.13.2.5 2010/07/22 14:18:36 schmirl Exp $
  */
 
 #include <ctype.h>
@@ -140,7 +140,12 @@ bool cConnectionHTTP::ProcessRequest(void)
 		}
 	}
 
-	if (Headers().at(REQUEST_METHOD).compare("GET") == 0 && ProcessURI(Headers().at(PATH_INFO))) {
+	tStrStrMap::const_iterator it_method = Headers().find(REQUEST_METHOD);
+	tStrStrMap::const_iterator it_pathinfo = Headers().find(PATH_INFO);
+	if (it_method == Headers().end() || it_pathinfo == Headers().end()) {
+		// should never happen
+		esyslog("streamdev-server connectionHTTP: Missing method or pathinfo");
+	} else if (it_method->second.compare("GET") == 0 && ProcessURI(it_pathinfo->second)) {
 		if (m_ChannelList)
 			return Respond("%s", true, m_ChannelList->HttpHeader().c_str());
 		else if (m_Channel != NULL) {
@@ -176,7 +181,7 @@ bool cConnectionHTTP::ProcessRequest(void)
 			return Respond("HTTP/1.0 404 not found")
 				&& Respond("");
 		}
-	} else if (Headers().at(REQUEST_METHOD).compare("HEAD") == 0 && ProcessURI(Headers().at(PATH_INFO))) {
+	} else if (it_method->second.compare("HEAD") == 0 && ProcessURI(it_pathinfo->second)) {
 		DeferClose();
 		if (m_ChannelList)
 			return Respond("%s", true, m_ChannelList->HttpHeader().c_str());
@@ -249,7 +254,8 @@ cChannelList* cConnectionHTTP::ChannelListFromString(const std::string& Path, co
 	const static std::string QUERY_STRING("QUERY_STRING");
 	const static std::string HOST("HTTP_HOST");
 
-	const std::string query = Headers().at(QUERY_STRING);
+	tStrStrMap::const_iterator it_query = Headers().find(QUERY_STRING);
+	const std::string& query = it_query == Headers().end() ? "" : it_query->second;
 
 	std::string groupTarget;
 	cChannelIterator *iterator = NULL;