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authorMax Kellermann <max@duempel.org>2009-03-28 11:10:40 +0100
committerMax Kellermann <max@duempel.org>2009-03-28 11:10:40 +0100
commit53ed647b224c98f74a3198215f9fa2fd1a359eb9 (patch)
treeec038560dd0f440d951d075b12e8263bafdf5be0 /src
parent80e2aaf3792fa662397005e72603d7e0c9e62dfc (diff)
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configure.ac: fail when ALSA is enabled but not found
This patch adds a small autoconf M4 library which deals with auto-detected features. The default for those features is "auto", which is like the old default: if the library is present on the system, enable the feature, disable otherwise. If the user explicitly enables that feature (--enable-alsa), and the library is not present, configure must fail, because it cannot fulfill the request.
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