diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5575541..110c66c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,9 @@ project(ww1game)
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
 
+include_directories("/usr/local/include")
+link_directories("/usr/local/lib")
+
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
diff --git a/src/main.hpp b/src/main.hpp
index 3873680..48b9555 100644
--- a/src/main.hpp
+++ b/src/main.hpp
@@ -29,6 +29,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include <iostream>
 #include <vector>
 #include <string>
+#include <cmath>
 
 // == Macros
 #define ASSET_PATH  "../assets"
diff --git a/src/renderer.cpp b/src/renderer.cpp
index 44b31dc..c47ed11 100644
--- a/src/renderer.cpp
+++ b/src/renderer.cpp
@@ -99,7 +99,7 @@ namespace Assets {
 bool run = true;
 
 float fps = 0.0f;
-std::chrono::_V2::system_clock::time_point time_prev = std::chrono::high_resolution_clock::now();
+auto time_prev = std::chrono::high_resolution_clock::now();
 long frameCounter = 0;
 int anim_div = 0;
 bool inMenu = true;
@@ -380,7 +380,7 @@ void renderLoop() {
     SDL_Event event;
     while (run) {
         //Uint32 time_now = SDL_GetTicks();
-        std::chrono::_V2::system_clock::time_point time_now = std::chrono::high_resolution_clock::now();
+        auto time_now = std::chrono::high_resolution_clock::now();
         float deltaTime = (time_now - time_prev).count() / 1000000000.0f;
         fps = (deltaTime > 0.0f) ? 1.0f / deltaTime : 1.0f;
         anim_div = std::roundl(fps / (float)ANIM_FPS);