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www.voip-info.org/wiki/view/Asterisk+Zaptel+Installation 
and
# cd /usr/src/asterisk-1.2.9.1 
# make clean
# makes mpg123
# Make 
# makes install 
# makes samples 
 
Posted by crouse
Compile
First check /usr/src/zaptel/zconfig.h for any specific configuration changes that might be appropriate. Then:
   ./configure            # cheks build syste. Not needed before 1.4
   make
   make install
If you get problems with 'depmod -a' announcing unresolved symbols, then
    * Try running 'depmod -ae' to see the names of the symbols it can't resolve. Maybe the names can give a hint where to look next.
    * Make sure you're using the latest versions of the various development tools (gcc etc)
    * Make sure you've got the kernel source / kernel headers, and kernel image all at a matching version. 
Posted by sagitraz
# cd /usr/src/asterisk-1.2.9.1 
# make clean
# makes mpg123
# Make 
# makes install 
# makes samples
Posted by carlos33