diff --git a/ChangeLog.md b/ChangeLog.md
index 8e313d2..616cc1d 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## v2.3.5 is coming
+
+1. 适配低级版本的`g++`，已在`g++ 4.4.7`上测试通过。
+
 ## v2.3.4
 
 1. 修改了设计上的问题，删除了`TrieManager`这个类，以避免造成一些可能的隐患。
diff --git a/README.md b/README.md
index 98e5307..f99b4e4 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
 
 ### 依赖
 
-* g++ (version >= 4.6 recommended);
+* g++ (version >= 4.4.7 recommended);
 * cmake (version >= 2.8 recommended);
 
 ### 下载和安装
diff --git a/src/HMMSegment.hpp b/src/HMMSegment.hpp
index 6deb52c..bd3a1df 100644
--- a/src/HMMSegment.hpp
+++ b/src/HMMSegment.hpp
@@ -136,21 +136,10 @@ namespace CppJieba
                 size_t now, old, stat;
                 double tmp, endE, endS;
 
-                try
-                {
-                    path = new int [XYSize];
-                    weight = new double [XYSize];
-                }
-                catch(const std::bad_alloc&)
-                {
-                    LogError("bad_alloc");
-                    return false;
-                }
-                if(NULL == path || NULL == weight)
-                {
-                    LogError("bad_alloc");
-                    return false;
-                }
+                path = new int [XYSize];
+                assert(path);
+                weight = new double [XYSize];
+                assert(weight);
 
                 //start
                 for(size_t y = 0; y < Y; y++)
diff --git a/src/KeywordExtractor.hpp b/src/KeywordExtractor.hpp
index 28b1e0e..4bb1fee 100644
--- a/src/KeywordExtractor.hpp
+++ b/src/KeywordExtractor.hpp
@@ -84,7 +84,7 @@ namespace CppJieba
                 {
                     if(_stopWords.end() != _stopWords.find(itr->first))
                     {
-                        itr = wordmap.erase(itr);
+                        wordmap.erase(itr++);
                         continue;
                     }
 
diff --git a/src/Trie.hpp b/src/Trie.hpp
index 4e5754a..925f5e4 100644
--- a/src/Trie.hpp
+++ b/src/Trie.hpp
@@ -77,8 +77,9 @@ namespace CppJieba
                 _minLogFreq = MAX_DOUBLE;
                 _setInitFlag(false);
             }
-            Trie(const string& filePath): Trie()
+            Trie(const string& filePath)
             {
+                Trie();
                 _setInitFlag(init(filePath));
             }
             ~Trie()
diff --git a/src/server.cpp b/src/server.cpp
index 95d9306..521743d 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -84,7 +84,8 @@ bool run(int argc, char** argv)
         }
 
         int pid = getpid();
-        string pidStr = to_string(pid);
+        string pidStr;
+        string_format(pidStr, "%d", pid);
         loadStr2File(val.c_str(), ios::out, pidStr);
         LogInfo("write pid[%s] into file[%s]", pidStr.c_str(), val.c_str());