Hello,
When you first tried to compile telemac system, did you use the makeall90 command or did you compile step by step (see installation guide for v6.0)? The first way should compile all libraries, modules, scalar executables and put them in relevant directories (e.g. /home/gustavo/TELEMAC/v6p1/telemac3d/tel3d_v6p1/gfortran_linux for telemac3dv6p1.exe). You should have telemac3dv6p1.exe in both /home/gustavo/TELEMAC/v6p1/telemac3d/tel3d_v6p1/gfortran_linux and /home/gustavo/TELEMAC/v6p1/telemac3d/tel3d_v6p1/sources directories, and so on for telemac2dv6p1.exe and sisyphev6p1.exe). If not, then your first compilation of the whole telemac system may have not been correctly done.
For older versions of Telemac-3d, as it was not available in open source before, I think that someone should have compiled for you or you may have done it by yourself correctly.
Regards,
Chi-Tuan