The OSMesa library is needed by some games and CAD-like applications to perform off-screen rendering.
On CrossOver 17 and greater, the simplest solution to fix this issue is to run: /path/to/cxoffice/bin/cxfix missinglibosmesa8 missinglibosmesa8.amd64
Or add --show-all to see how CrossOver would fix it on your platform and others.
Alternatively you may try one of the commands below.
The commands usually also apply to newer versions of the distributions above as well as derived distributions. So for instance a fix for Debian 7 may still be valid for the latest Debian Testing and is typically also applicable to Ubuntu, Linux Mint, Deepin and Pop! OS. Similarly a fix for Fedora likely also works on Red Hat Enterprise Linux, CentOS, etc.
(1) This library is broken on Fedora 17 (see Red Hat issue 838228). The recommended fix is to upgrade to a newer Fedora release.
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