diff --git a/CMakeLists.txt b/CMakeLists.txt
index d61b3229..3bc982a5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,10 @@ if(WIN32)
 cmake_minimum_required (VERSION 3.15)
 cmake_policy(SET CMP0091 NEW)
 else()
-cmake_minimum_required (VERSION 3.11)
+cmake_minimum_required (VERSION 3.5)
+if (POLICY CMP0069)
+    cmake_policy(SET CMP0069 NEW)
+endif()
 endif()
 project (sfizz VERSION 0.2.0 LANGUAGES CXX C)
 set(PROJECT_DESCRIPTION "A library to load SFZ description files and use them to render music.")
diff --git a/cmake/CheckIPO.cmake b/cmake/CheckIPO.cmake
index c86d3c04..5b524df7 100644
--- a/cmake/CheckIPO.cmake
+++ b/cmake/CheckIPO.cmake
@@ -1,9 +1,21 @@
 # Added in CMake 3.9
+
+if (CMAKE_VERSION VERSION_LESS 3.9)
+    message (WARNING "\nIPO checks are only available on CMake 3.9 and later.")
+
+    set(ENABLE_LTO OFF CACHE BOOL "" FORCE)
+
+    function (SFIZZ_ENABLE_LTO_IF_NEEDED TARGET)
+    endfunction()
+
+    return()
+endif()
+
 include (CheckIPOSupported)
 check_ipo_supported (RESULT result OUTPUT output)
 
 if (CMAKE_SYSTEM_PROCESSOR STREQUAL armv7l)
-    set(ENABLE_LTO OFF)
+    set(ENABLE_LTO OFF CACHE BOOL "" FORCE)
 endif()
 
 if (result AND ENABLE_LTO AND CMAKE_BUILD_TYPE STREQUAL "Release")
@@ -14,7 +26,7 @@ else()
     else()
         message (WARNING "\nIPO was disabled or not in a Release build.")
     endif()
-    set (ENABLE_LTO OFF)
+    set(ENABLE_LTO OFF CACHE BOOL "" FORCE)
 endif()
 
 function (SFIZZ_ENABLE_LTO_IF_NEEDED TARGET)