configure: error:

  Tcl cannot be found on this system.

  Eggdrop requires Tcl and the Tcl development files to compile.
  If you already have Tcl installed on this system, make sure you
  also have the development files (common package names include
  'tcl-dev' and 'tcl-devel'). If I just wasn't looking
  in the right place for it, re-run ./configure using the
  --with-tcllib='/path/to/libtcl.so' and
  --with-tclinc='/path/to/tcl.h' options.

  See doc/COMPILE-GUIDE's 'Tcl Detection and Installation' section for more
  information.