diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9eea334..43eca2b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,10 +2,6 @@ cmake_minimum_required(VERSION 3.25)
 
 project(Rum VERSION 1.0)
 
-# compiler setup
-set(CMAKE_C_COMPILER gcc)
-set(CMAKE_CXX_COMPILER g++)
-
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
@@ -31,6 +27,7 @@ target_include_directories(rum-shared PUBLIC "${CMAKE_SOURCE_DIR}/inc")
 add_executable(example "${CMAKE_SOURCE_DIR}/src/server.cpp")
 target_link_libraries(example rum-shared)
 if(USE_FLAGS)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DUSE_FLAGS")
     target_link_libraries(example flags-cpp)
 endif()
 
diff --git a/src/rum/http/request.cpp b/src/rum/http/request.cpp
index 5a5b861..7d9f11e 100644
--- a/src/rum/http/request.cpp
+++ b/src/rum/http/request.cpp
@@ -1,6 +1,8 @@
 #include <rum/http/method.h>
 #include <rum/http/request.h>
+#if __cplusplus >= 202302L
 #include <format>
+#endif
 #include <iostream>
 #include <string>
 
diff --git a/src/rum/http/response.cpp b/src/rum/http/response.cpp
index cb72b99..f8326f1 100644
--- a/src/rum/http/response.cpp
+++ b/src/rum/http/response.cpp
@@ -1,7 +1,9 @@
 #include <rum/http/response.h>
 #include <rum/tcp/error.h>
 #include <sys/socket.h>
+#if __cplusplus >= 202302L
 #include <format>
+#endif
 #include <map>
 #include <stdexcept>
 #include <string>
diff --git a/src/rum/http/uri.cpp b/src/rum/http/uri.cpp
index 022d811..03d2ced 100644
--- a/src/rum/http/uri.cpp
+++ b/src/rum/http/uri.cpp
@@ -2,7 +2,9 @@
 #include <exception>
 #include <iostream>
 #include <regex>
+#if __cplusplus >= 202302L
 #include <format>
+#endif
 #include <string>
 
 namespace Rum::HTTP {