blob: 07f7e69369412635ec6b3b5ffaab839654f51cba (
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diff --git a/CMakeLists.txt b/CMakeLists.txt
index a871f4c..f9f6b34 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -965,7 +965,8 @@ OPTION(ALSOFT_REQUIRE_DSOUND "Require DirectSound backend" OFF)
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)
+ set(CMAKE_REQUIRED_DEFINITIONS -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)
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