Before asterisk will compile MeetMe, it needs to detect either Dahdi or Zaptel when you do ./configure before compiling. Download Dahdi-Linux and Dahdi-Tools and build and install both. Then go back and ./configure asterisk again, make all, make install.
Once that is done, you can verify the MeetMe module is loaded by either looking in /var/lib/asterisk/modules for app_meetme.so or you can use the asterisk CLI> “module show like MeetMe”.