diff --git a/a.out b/a.out
index cc38265..3e4a221 100755
Binary files a/a.out and b/a.out differ
diff --git a/hello_world.cpp b/hello_world.cpp
index 9c701fd..5daa12b 100644
--- a/hello_world.cpp
+++ b/hello_world.cpp
@@ -7,11 +7,11 @@ int main()
  cv::Mat img = cv::Mat::zeros(120, 350, CV_8UC3); 
  
  // write text on the image 
-putText(img, “Hello World”, cv::Point(15, 70), cv::FONT_HERSHEY_PLAIN, 3, cv::Scalar(0, 255, 0), 
+putText(img, "Hello World", cv::Point(15, 70), cv::FONT_HERSHEY_PLAIN, 3, cv::Scalar(0, 255, 0), 
 4); 
  
 // display the image 
-imshow(“Win”, img); 
+imshow("Win", img); 
  
 // wait for a key press to exit the program 
 cv::waitKey(0); 
diff --git a/hello_world.o b/hello_world.o
new file mode 100644
index 0000000..95ce373
Binary files /dev/null and b/hello_world.o differ
diff --git a/main.cpp b/main.cpp
index bd68921..b92deea 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,6 +1,6 @@
 #include <iostream>
 #include "arithmetic.h"
-#include "opencv/opencv.hpp"
+#include "opencv2/opencv.hpp"
 
 int main()
 {
diff --git a/main.o b/main.o
index d297d55..449f1de 100644
Binary files a/main.o and b/main.o differ
diff --git a/makefile b/makefile
index 751412c..c8d4137 100644
--- a/makefile
+++ b/makefile
@@ -2,13 +2,13 @@ all: main arithmetic hello
 	g++ main.o arithmetic.o -L/usr/lib/x86_64-linux-gnu -lopencv_core 
 
 main: main.cpp
-	g++ -c main.cpp -l/usr/include
+	g++ -c main.cpp -I/usr/include/opencv4
 	
 arithmetic: arithmetic.cpp arithmetic.h
 	g++ -c arithmetic.cpp
 	
 hello: hello_world.cpp
-	g++ -c hello_world.cpp -l/usr/include
+	g++ -c hello_world.cpp -I/usr/include/opencv4
 
 clean:
 	rm *.o