ALSA support are requested, but not found on your system

Trying to build arts with cmake. I received the following message: "ALSA support are requested, but not found on your system" Looking at the CMakeLists.txt file, I see the script is checking for "alsa/asoundlib.h." ALSA is indeed installed and working well here. On Slackware 12.2 that file exists at: /usr/include/alsa/asoundlib.h /usr/include/sys/asoundlib.h How do I fix? BTW, you might want to change the error message from: ALSA support are requested, but not found on your system To: ALSA support requested, but not found on your system The latter is more grammatically correct in English. :) Darrell