Created attachment 222504 [details] Patch to support changes in devel/cereal devel/cereal was updated to new version and now it is an include-only implementation. So, cad/PrusaSlicaer should not link to cereal library.
devel/cereal changes: https://github.com/freebsd/freebsd-ports/commit/9e09408399c3fb3c976f831b7da797f84c62345e
A commit references this bug: Author: amdmi3 Date: Wed Feb 17 22:52:33 UTC 2021 New revision: 565820 URL: https://svnweb.freebsd.org/changeset/ports/565820 Log: - Fix build with after devel/cereal update PR: 253569 Submitted by: teodorsigaev@gmail.com (maintainer) Changes: head/cad/PrusaSlicer/Makefile head/cad/PrusaSlicer/files/patch-src_CMakeLists.txt head/cad/PrusaSlicer/files/patch-src_libslic3r_CMakeLists.txt head/cad/PrusaSlicer/files/patch-src_slic3r_CMakeLists.txt