Initial support of linux for viewer example.

examples/viewer/Makefile

@@ -1,6 +1,12 @@
 GLFW_INC=-I/usr/local/include 
-GLFW_LIBS=-L/usr/local/lib -lglfw3 -lglew
-GL_LIBS=-framework OpenGL
+
+# OSX
+#GLFW_LIBS=-L/usr/local/lib -lglfw3 -lGLEW
+#GL_LIBS=-framework OpenGL
+
+# Linux
+GLFW_LIBS=-L/usr/local/lib -lglfw3 -lGLEW
+GL_LIBS=-lGL -lGLU -lX11 -lXrandr -lXi -lXxf86vm -lXcursor -lXinerama -ldl -pthread
 
 CXX_FLAGS=-Wno-deprecated-declarations
 

examples/viewer/viewer.cc

@@ -4,6 +4,7 @@
 #include <vector>
 #include <string>
 #include <cstdio>
+#include <cstdlib>
 #include <iostream>
 #include <limits>
 #include <cmath>
@@ -345,6 +346,7 @@ int main(int argc, char **argv)
   }
 
   glfwMakeContextCurrent(window);
+  glfwSwapInterval(1);
 
   // Callback
   glfwSetWindowSizeCallback(window, reshapeFunc);