Explicitly link against -lpthread on Unix
Explicitly link against -lpthread on Unix

/usr/bin/ld.lld: error: undefined symbol: pthread_condattr_init
>>> referenced by src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp
>>>               src/3rdParty/salomesmesh/CMakeFiles/SMESH.dir/src/SMESH/SMESH_Mesh.cpp.o:(boost::condition_variable::condition_variable())

/usr/bin/ld.lld: error: undefined symbol: pthread_condattr_setclock
>>> referenced by src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp
>>>               src/3rdParty/salomesmesh/CMakeFiles/SMESH.dir/src/SMESH/SMESH_Mesh.cpp.o:(boost::condition_variable::condition_variable())

/usr/bin/ld.lld: error: undefined symbol: pthread_condattr_destroy
>>> referenced by src/3rdParty/salomesmesh/src/SMESH/SMESH_Mesh.cpp
>>>               src/3rdParty/salomesmesh/CMakeFiles/SMESH.dir/src/SMESH/SMESH_Mesh.cpp.o:(boost::condition_variable::condition_variable())

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master