netgen-headers 6.2.2006+really6.2.1905+dfsg-2.1 (amd64 binary) in ubuntu hirsute

 NETGEN is an automatic 3d tetrahedral mesh generator. It accepts
 input from constructive solid geometry (CSG) or boundary
 representation (BRep) from STL file format. The connection to a
 geometry kernel allows the handling of IGES and STEP files. NETGEN
 contains modules for mesh optimization and hierarchical mesh
 refinement.
 .
 This package contains internal headers.