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I wanted to install the package noweb so as usual I tried with tlmgr install noweb but tlmgr returned a:
package noweb not present in package repository
Later I noticed that the noweb package is in a separate CTAN directory called web and that all the packages in this directory cannot be installed with the standard tlmgr command.
So, how do I install noweb and other web packages?
The noweb bundle is a “literate programming tool” inspired by Knuth's Web. It needs executables that are provided only by some platforms (and the last build date is 2006), so probably they need to be rebuilt following the instructions.
It's not in TeX Live, so it cannot be installed with tlmgr because the license is non free:
COPYRIGHT
Noweb is copyright 1989-2006 by Norman Ramsey. All rights reserved.
You may use and distribute noweb for any purpose, for free. You may modify noweb and create derived works, provided you retain the copyright notice, but the result may not be called noweb without my written consent. You may not sell noweb itself, but you may do anything you like with programs created with noweb.
While the notice says the program is free, the way the license is written doesn't qualify it as “Free Software” in a strict sense. If you want to install and use noweb, you have to do it yourself.
nowebrequires also executables that need to be built for your platform. It's not available in TeX Live because it has a non-free license: “Noweb is copyright 1989-2006 by Norman Ramsey. All rights reserved. You may use and distribute noweb for any purpose, for free. You may modify noweb and create derived works, provided you retain the copyright notice, but the result may not be called noweb without my written consent.”