diff -rupN --no-dereference openal-soft-1.18.2/CMakeLists.txt openal-soft-1.18.2-new/CMakeLists.txt
--- openal-soft-1.18.2/CMakeLists.txt	2021-08-12 09:22:41.114882052 +0200
+++ openal-soft-1.18.2-new/CMakeLists.txt	2021-08-12 09:22:41.117882030 +0200
@@ -574,7 +574,7 @@ ENDIF()
 
 
 # Check if we have Windows headers
-CHECK_INCLUDE_FILE(windows.h HAVE_WINDOWS_H -D_WIN32_WINNT=0x0502)
+CHECK_INCLUDE_FILE(windows.h HAVE_WINDOWS_H)
 IF(NOT HAVE_WINDOWS_H)
     CHECK_SYMBOL_EXISTS(gettimeofday sys/time.h HAVE_GETTIMEOFDAY)
     IF(NOT HAVE_GETTIMEOFDAY)
@@ -965,7 +965,7 @@ OPTION(ALSOFT_REQUIRE_DSOUND "Require Di
 OPTION(ALSOFT_REQUIRE_MMDEVAPI "Require MMDevApi backend" OFF)
 IF(HAVE_WINDOWS_H)
     # Check MMSystem backend
-    CHECK_INCLUDE_FILES("windows.h;mmsystem.h" HAVE_MMSYSTEM_H -D_WIN32_WINNT=0x0502)
+    CHECK_INCLUDE_FILES("windows.h;mmsystem.h" HAVE_MMSYSTEM_H)
     IF(HAVE_MMSYSTEM_H)
         CHECK_SHARED_FUNCTION_EXISTS(waveOutOpen "windows.h;mmsystem.h" winmm "" HAVE_LIBWINMM)
         IF(HAVE_LIBWINMM)