The Tcl package contains the Tool Command Language. &buildtime; &tcl-time-tools; &diskspace; &tcl-compsize-tools; &aa-tcl-down; &aa-tcl-dep;   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. Even if you are not running the test suites here in this chapter as per our recommendation, these packages are still required for running the test suites in the next chapter. Prepare Tcl for compilation: cd unix ./configure --prefix=/tools Build the package: make (If you insist on testing the results, then issue: TZ=UTC make test. However, the Tcl test suite is known to experience failures under certain host conditions that are not fully understood. Therefore, test suite failures here are not surprising, and are not considered critical. The TZ=UTC parameter sets the time zone to Coordinated Universal Time (UTC) also known as Greenwich Mean Time (GMT), but only for the duration of the test suite run. This ensures the clock tests are exercised correctly. More information on the TZ environment variable will be given later on in .) Install the package: make install Do not remove the tcl&tcl-version; source directory yet, as the next package will need its internal headers. And make a necessary symbolic link: ln -s tclsh8.4 /tools/bin/tclsh &aa-tcl-shortdesc; &aa-tcl-desc;