GLFW include path.

Former-commit-id: bf28ac344fee7699962e8edbed572df4e71384d6

shared/cmake/libigl.cmake

@@ -367,6 +367,7 @@ if(LIBIGL_WITH_OPENGL)
       set(GLFW_BUILD_DOCS OFF CACHE BOOL " " FORCE)
       set(GLFW_BUILD_INSTALL OFF CACHE BOOL " " FORCE)
       add_subdirectory(${NANOGUI_DIR}/ext/glfw glfw)
+      target_include_directories(glfw ${IGL_SCOPE} ${NANOGUI_DIR}/ext/glew/include)
     endif()
     target_link_libraries(igl_opengl_glfw ${IGL_SCOPE} igl_opengl glfw)