diff --git a/Makefile b/Makefile
index ec74a813..0ebaf1b0 100644
--- a/Makefile
+++ b/Makefile
@@ -124,7 +124,7 @@ $(APPNAMESO): $(LIBNAMESO) src/yolo_v2_class.hpp src/yolo_console_dll.cpp
 endif
 
 $(EXEC): $(OBJS)
-	$(CPP) $(COMMON) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+	$(CPP) -std=c++11 $(COMMON) $(CFLAGS) $^ -o $@ $(LDFLAGS)
 
 $(OBJDIR)%.o: %.c $(DEPS)
 	$(CC) $(COMMON) $(CFLAGS) -c $< -o $@
diff --git a/src/http_stream.cpp b/src/http_stream.cpp
index 3a5ce61c..57feea0e 100644
--- a/src/http_stream.cpp
+++ b/src/http_stream.cpp
@@ -1,3 +1,5 @@
+#include "http_stream.h"
+
 #ifdef OPENCV
 //
 // a single-threaded, multi client(using select), debug webserver - streaming out mjpg.
@@ -40,6 +42,7 @@ struct _INIT_W32DATA
 #include <cstdio>
 #include <vector>
 #include <iostream>
+#include <algorithm>
 using std::cerr;
 using std::endl;
 
@@ -52,7 +55,6 @@ using std::endl;
 #endif
 using namespace cv;
 
-#include "http_stream.h"
 #include "image.h"
 
 
@@ -280,7 +282,7 @@ image image_data_augmentation(IplImage* ipl, int w, int h,
     cv::Rect img_rect(cv::Point2i(0, 0), img.size());
     cv::Rect new_src_rect = src_rect & img_rect;
 
-    cv::Rect dst_rect(cv::Point2i(std::max(0, -pleft), std::max(0, -ptop)), new_src_rect.size());
+    cv::Rect dst_rect(cv::Point2i(std::max<int>(0, -pleft), std::max<int>(0, -ptop)), new_src_rect.size());
 
     cv::Mat cropped(cv::Size(src_rect.width, src_rect.height), img.type());
     cropped.setTo(cv::Scalar::all(0));
@@ -330,6 +332,8 @@ image image_data_augmentation(IplImage* ipl, int w, int h,
 
 #endif    // OPENCV
 
+// -----------------------------------------------------
+
 #if __cplusplus >= 201103L || _MSC_VER >= 1900  // C++11
 
 #include <chrono>
diff --git a/src/http_stream.h b/src/http_stream.h
index 166c1c7e..b7702250 100644
--- a/src/http_stream.h
+++ b/src/http_stream.h
@@ -2,6 +2,11 @@
 #ifndef HTTP_STREAM_H
 #define HTTP_STREAM_H
 
+#ifdef OPENCV
+#include "opencv2/highgui/highgui_c.h"
+#include "opencv2/imgproc/imgproc_c.h"
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif