A number of prebuilt binary packages are available for the major platforms.
These packages have been compiled against Tcl 8.6.
TclRAL also has a TEA compliant build scheme and cloning the repository
will give you access to all the source. Building is the usual configure,
make scheme.

  *  64-bit, Tcl 8.6]
  *  OSX 10.10, 32 and 64 bit]
  *  64, Tcl 8.6]
  *  32, Tcl 8.6]

Man page documentation]
is also available.

The companion package, ralutil, is a Tcl only package that provides a set of
convenience procedures.

  *  package]
  *  manual]