Ciao, 2009/10/10 <cgnicholas at alamedanet.net>: [...] > ifneq ($(strip $(CXX)),) > default: stlib > else > default: > endif right, you need to configure GRASS with --with-cxx since r.terraflow is a C++ module. Martin -- Martin Landa <landa.martin gmail.com> * http://gama.fsv.cvut.cz/~landa