Fix issues on compiling on Linux platform.

.gitignore

@@ -0,0 +1,2 @@
+cmake-build-debug/
+.idea

CGProject/CMakeLists.txt

@@ -1,13 +1,26 @@
 cmake_minimum_required(VERSION 3.3)
 project(CGProject)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+## OpenGL
+FIND_PACKAGE(OpenGL REQUIRED)
+FIND_PACKAGE(GLUT REQUIRED)
+INCLUDE_DIRECTORIES(${OPENGL_INCLUDE_DIR})
+INCLUDE_DIRECTORIES(${GLUT_INCLUDE_DIR})
+
+## default
+set(CMAKE_CXX_STANDARD 17)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
 
 set(SOURCE_FILES
-    main.cpp
-    mtl.cpp
-    mtl.hpp
-    obj.cpp
-    obj.hpp)
+        main.cpp
+        glm.cpp
+        Mtl.cpp
+        Mtl.h
+        Obj.cpp
+        Obj.h)
+
+add_executable(CGProject ${SOURCE_FILES})
 
-add_executable(CGProject ${SOURCE_FILES})
+## add linked libraries
+TARGET_LINK_LIBRARIES(CGProject ${OPENGL_LIBRARIES} ${GLUT_LIBRARIES})

CGProject/Mtl.cpp

@@ -16,8 +16,13 @@
 // C Headers
 #include <stdio.h>
 // OpenGL and GLM Headers
+#ifndef __linux
 #include <glut/glut.h>
 #include <opengl/gl.h>
+#else
+#include <GL/glut.h>
+#include <GL/gl.h>
+#endif
 //#include "glm.hpp"
 
 using namespace std;

CGProject/Mtl.h

@@ -17,8 +17,13 @@
 // C Headers
 #include <stdio.h>
 // OpenGL and GLM Headers
+#ifndef __linux
 #include <glut/glut.h>
 #include <opengl/gl.h>
+#else
+#include <GL/glut.h>
+#include <GL/gl.h>
+#endif
 //#include "glm.hpp"
 
 using namespace std;

CGProject/Obj.cpp

@@ -18,8 +18,13 @@
 // C Headers
 #include <stdio.h>
 // OpenGL and GLM Headers
+#ifndef __linux
 #include <glut/glut.h>
 #include <opengl/gl.h>
+#else
+#include <GL/glut.h>
+#include <GL/gl.h>
+#endif
 //#include "glm.hpp"
 
 using namespace std;

CGProject/Obj.h

@@ -17,8 +17,13 @@
 // C Headers
 #include <stdio.h>
 // OpenGL and GLM Headers
+#ifndef __linux
 #include <glut/glut.h>
 #include <opengl/gl.h>
+#else
+#include <GL/glut.h>
+#include <GL/gl.h>
+#endif
 //#include "glm.hpp"
 
 using namespace std;

CGProject/glm.h

@@ -8,8 +8,11 @@
 
 
 /* includes */
+#ifndef __linux
 #include <opengl/gl.h>
-
+#else
+#include <GL/gl.h>
+#endif
 
 #ifndef M_PI
 #define M_PI 3.14159265