gnuradio PORT v 3.7.13.5 fails to install - error related to libusb activation

[XE3ADC (Abraham Diaz de Leon)]

Hello, i encountered an error during the installation of GNURADIO port v 3.7.13.5 on OSX El Capitan, Xcode v8.2, could you please help me to correct this issue to be able to have a correct installation of GNURADIO? down below is the error description obtained from the console, Thanks in advance and best regards, Abraham Diaz de Leon Camou Villahermosa - Tabasco - Mexico

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Console output:
--->  Fetching archive for libusb
--->  Attempting to fetch libusb-1.0.23_0.darwin_15.x86_64.tbz2 from https://packages.macports.org/libusb
--->  Attempting to fetch libusb-1.0.23_0.darwin_15.x86_64.tbz2.rmd160 from https://packages.macports.org/libusb
--->  Installing libusb @1.0.23_0
--->  Activating libusb @1.0.23_0
Error: Failed to activate libusb: Image error: /opt/local/lib/libusb-1.0.0.dylib already exists and does not belong to a registered port.  Unable to activate port libusb. Use 'port -f activate libusb' to force the activation.
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_libusb/libusb/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port gnuradio failed