$NetBSD: patch-CMakeLists.txt,v 1.5 2021/05/26 02:34:02 fox Exp $

Only define __LINUX_ALSA__ on Linux.

--- CMakeLists.txt.orig	2021-05-23 18:35:57.000000000 +0000
+++ CMakeLists.txt
@@ -29,10 +29,16 @@ endif()
 target_link_libraries(ft2-clone
     PRIVATE m asound pthread ${SDL2_LIBRARIES})
 
-target_compile_definitions(ft2-clone
-    PRIVATE HAS_MIDI
-    PRIVATE __LINUX_ALSA__
-    PRIVATE HAS_LIBFLAC)
+if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+    target_compile_definitions(ft2-clone
+        PRIVATE HAS_MIDI
+        PRIVATE __LINUX_ALSA__
+        PRIVATE HAS_LIBFLAC)
+else()
+    target_compile_definitions(ft2-clone
+        PRIVATE HAS_MIDI
+        PRIVATE HAS_LIBFLAC)
+endif()
 
 install(TARGETS ft2-clone
     RUNTIME DESTINATION bin)