diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0e6e4ec8..f1170aad 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,9 +4,9 @@ project (DROGON CXX)
 
 
 
-EXEC_PROGRAM (gcc ARGS "--version | grep '^gcc'|awk '{print $3}' | sed s'/)//g'" OUTPUT_VARIABLE version)
+EXEC_PROGRAM (gcc ARGS "--version | grep '^gcc'|awk '{print $3}' | sed s'/)//g' | sed s'/-.*//g'" OUTPUT_VARIABLE version)
 MESSAGE(STATUS "This is gcc version:: " ${version})
-if(version LESS 4.7.0)
+if(version LESS 4.9.0)
     MESSAGE(STATUS "gcc is too old")
     stop()
 elseif (version LESS 6.1.0)
diff --git a/lib/src/HttpAppFramework.cc b/lib/src/HttpAppFramework.cc
index 2fab8cde..bd8d811a 100755
--- a/lib/src/HttpAppFramework.cc
+++ b/lib/src/HttpAppFramework.cc
@@ -150,7 +150,7 @@ void HttpAppFrameworkImpl::initRegex() {
     for(auto binder:_apiCtrlVector)
     {
         std::regex reg("\\(\\[\\^/\\]\\*\\)");
-        std::string tmp=std::regex_replace(binder.pathParameterPattern,reg,std::string("[^/]*"));
+        std::string tmp=std::regex_replace(binder.pathParameterPattern,reg,"[^/]*");
         regString.append("(").append(tmp).append(")|");
     }
     if(regString.length()>0)
@@ -227,7 +227,7 @@ void HttpAppFrameworkImpl::addApiPath(const std::string &path,
     _binder.queryParametersPlaces=std::move(parametersPlaces);
     _binder.binderPtr=binder;
     _binder.filtersName=filters;
-    _binder.pathParameterPattern=std::regex_replace(originPath,regex,std::string("([^/]*)"));
+    _binder.pathParameterPattern=std::regex_replace(originPath,regex,"([^/]*)");
     std::lock_guard<std::mutex> guard(_apiCtrlMutex);
     _apiCtrlVector.push_back(std::move(_binder));
 }
diff --git a/trantor b/trantor
index 4bcf7b3c..6c401f8f 160000
--- a/trantor
+++ b/trantor
@@ -1 +1 @@
-Subproject commit 4bcf7b3ce13f011d05dedf406a1975b2881e43ca
+Subproject commit 6c401f8f83b94d60c2dca60e481cab1a786485e4