libgeos++-dev 3.8.0-1 (armhf binary) in ubuntu focal

 GEOS provides a spatial object model and fundamental geometric
 functions. It implements the geometry model defined in the
 OpenGIS Consortium Simple Features Specification for SQL.
 .
 This package contains the headers and libraries needed to
 develop programs using GEOS in C++. Note that third-parties
 programs should use the stable C API instead of the
 unstable C++ one.