This package and the next two are only installed to be able to run the test suites for GCC and Binutils. Installing three packages just for testing purposes may seem like overkill, but it is very reassuring, if not essential, to know that our most important tools are working properly. Prepare Tcl to be compiled: cd unix ./configure --prefix=/tools Build the package: make This package has a test suite available which can perform a number of checks to ensure it built correctly. Should you choose to run it, the following command will do so: TZ=UTC make test Sometimes, package test suites will give false failures. You can consult the LFS Wiki at to verify that these failures are normal. This applies to all tests throughout the book. Install the package: make install Make a link: ln -s tclsh8.4 /tools/bin/tclsh Do not remove the tcl&tcl-version; source directory yet, as the next package will need its internal headers.