sorry to bother you for this, but after compiling everything and having the osmocon and mobile application working, I found out that the layer23 application is missing. Can you help me understanding which one are the sources for it and which make file is responsible for its compilation, I really can't figure out what went wrong.
Your compilation went well but the layer23 application you are searching for doesn't exist any more since this changeset
http://bb.osmocom.org/trac/changeset/88eb926637fe6864134509842af6757ff3dbdb8...
three months ago. It's now called ccch_scan and you should look at the ML, the code and further changes to see if it does what you expected from layer23 to do.
Regards, Mad