Bug#892331: 3depict: Please use 'pkg-config' to find FreeType 2

[D Haley]

Hi,

I've picked a patch from upstream to fix this, it is now in the git
repository, and should be fixed at next upload.

https://salsa.debian.org/science-team/3depict/commit/964dba2bda590d1e9ab1ec8705159b99df7bc9b6

Thanks.