I am trying to install Demeter on my mac and am encountering the following error during installation:

--->  Building pgplot

Error: Failed to build pgplot: command execution failed

Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_pgplot/pgplot/main.log for details.

Error: Follow 
https://guide.macports.org/#project.tickets to report a bug.

Error: Processing of port demeter failed