--- CMakeLists.txt.orig	2024-01-11 08:52:00 UTC
+++ CMakeLists.txt
@@ -1,7 +1,7 @@ else()
 if(WIN32)
     cmake_minimum_required(VERSION 3.22.0)
 else()
-    cmake_minimum_required(VERSION 2.8.12)
+    cmake_minimum_required(VERSION 2.8.12...3.28.1)
 endif()
 
 # force out-of-source build
@@ -31,7 +31,7 @@ if ("${BUILD_TYPE_UPPER}" STREQUAL "RELEASE")
 string(TOUPPER "${CMAKE_BUILD_TYPE}" BUILD_TYPE_UPPER)
 if ("${BUILD_TYPE_UPPER}" STREQUAL "RELEASE")
     set(CMAKE_BUILD_TYPE "Release" CACHE STRING "Build Type" FORCE)
-    set(CMAKE_C_FLAGS "-DNDEBUG -O2 ${CMAKE_C_FLAGS}")
+    set(CMAKE_C_FLAGS "-DNDEBUG ${CMAKE_C_FLAGS}")
 elseif("${BUILD_TYPE_UPPER}" STREQUAL "DEBUG")
     set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Build Type" FORCE)
     set(CMAKE_C_FLAGS "-g3 -O0 ${CMAKE_C_FLAGS}")