Hello, Andrey !
> !!! Fetch for /usr/local/sci/app-office/texmacs/texmacs-1.0.6.8.ebuildfailed,
> continuing...
Are you sure that you have fetched an uncorrupted copy of
TeXmacs-1.0.6.8-src.tar.gz ? My copy has the size 3835265.
Manifest has been generated from this copy, and contains this size (and
texmacs-1.0.6.8 emerges without any problems).