Set the backend HAVE_ macros off before checking their availability
tree4a6d87ea4a0f890e3eed90247614000b3fd8e050
-rw-r--r-- 6 .gitignore
drwxr-xr-x - Alc
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-rw-r--r-- 25269 COPYING
drwxr-xr-x - OpenAL32
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