diff --git a/src/jsontestrunner/main.cpp b/src/jsontestrunner/main.cpp
index df717ff..3452c59 100644
--- a/src/jsontestrunner/main.cpp
+++ b/src/jsontestrunner/main.cpp
@@ -335,7 +335,6 @@ int main(int argc, const char* argv[]) {
     std::cerr << "Unhandled exception:" << std::endl << e.what() << std::endl;
     return 1;
   }
-  return 0;
 }
 
 #if defined(__GNUC__)
diff --git a/src/lib_json/json_value.cpp b/src/lib_json/json_value.cpp
index 1317501..0872ff5 100644
--- a/src/lib_json/json_value.cpp
+++ b/src/lib_json/json_value.cpp
@@ -52,7 +52,7 @@ template <typename T>
 static std::unique_ptr<T> cloneUnique(const std::unique_ptr<T>& p) {
   std::unique_ptr<T> r;
   if (p) {
-    r = std::make_unique<T>(*p);
+    r = std::unique_ptr<T>(new T(*p));
   }
   return r;
 }
@@ -840,6 +840,7 @@ bool Value::isConvertibleTo(ValueType other) const {
            (type() == realValue && InRange(value_.real_, 0, maxUInt)) ||
            type() == booleanValue || type() == nullValue;
   case realValue:
+    return isNumeric() || type() == booleanValue || type() == nullValue;
   case booleanValue:
     return isNumeric() || type() == booleanValue || type() == nullValue;
   case stringValue:
@@ -1239,7 +1240,7 @@ Value::Members Value::getMemberNames() const {
   ObjectValues::const_iterator it = value_.map_->begin();
   ObjectValues::const_iterator itEnd = value_.map_->end();
   for (; it != itEnd; ++it) {
-    members.emplace_back(String((*it).first.data(), (*it).first.length()));
+    members.push_back(String((*it).first.data(), (*it).first.length()));
   }
   return members;
 }
@@ -1396,7 +1397,7 @@ String Value::Comments::get(CommentPlacement slot) const {
 
 void Value::Comments::set(CommentPlacement slot, String comment) {
   if (!ptr_) {
-    ptr_ = std::make_unique<Array>();
+    ptr_ = std::unique_ptr<Array>(new Array());
   }
   // check comments array boundry.
   if (slot < CommentPlacement::numberOfCommentPlacement) {
@@ -1548,7 +1549,7 @@ void Path::makePath(const String& path, const InArgs& in) {
       const char* beginName = current;
       while (current != end && !strchr("[.", *current))
         ++current;
-      args_.emplace_back(String(beginName, current));
+      args_.push_back(String(beginName, current));
     }
   }
 }
diff --git a/src/test_lib_json/main.cpp b/src/test_lib_json/main.cpp
index 9b94e5f..991c247 100644
--- a/src/test_lib_json/main.cpp
+++ b/src/test_lib_json/main.cpp
@@ -2732,11 +2732,12 @@ JSONTEST_FIXTURE_LOCAL(StreamWriterTest, escapeTabCharacterWindows) {
 
 struct ReaderTest : JsonTest::TestCase {
   void setStrictMode() {
-    reader = std::make_unique<Json::Reader>(Json::Features{}.strictMode());
+    reader = std::unique_ptr<Json::Reader>(
+        new Json::Reader(Json::Features{}.strictMode()));
   }
 
   void setFeatures(Json::Features& features) {
-    reader = std::make_unique<Json::Reader>(features);
+    reader = std::unique_ptr<Json::Reader>(new Json::Reader(features));
   }
 
   void checkStructuredErrors(