diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b0ec30..6202553 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,9 @@ cmake_minimum_required(VERSION 2.8)
 SET(COMPILE_DEFINITIONS -Werror)
 
 include_directories(/opt/vc/include)
+include_directories(/opt/vc/include/interface/vcos/pthreads)
+include_directories(/opt/vc/include/interface/vmcs_host)
+include_directories(/opt/vc/include/interface/vmcs_host/linux)
 
 link_directories(/opt/vc/lib)
 
diff --git a/main.c b/main.c
index 3b3c65a..08e134c 100644
--- a/main.c
+++ b/main.c
@@ -75,7 +75,7 @@ int process() {
     while (1) {
         ret = vc_dispmanx_snapshot(display, screen_resource, 0);
         vc_dispmanx_resource_read_data(screen_resource, &rect1, fbp, vinfo.xres * vinfo.bits_per_pixel / 8);
-        usleep(50 * 1000);
+        usleep(25 * 1000);
     }
 
     munmap(fbp, finfo.smem_len);