Build fails on macOS 10.13

[workflowsguy]

sudo port -t install difftastic
--->  Computing dependencies for difftastic
--->  Fetching archive for difftastic
--->  Attempting to fetch difftastic-0.46.0_0.darwin_17.x86_64.tbz2 from http://packages.macports.org/difftastic
--->  Attempting to fetch difftastic-0.46.0_0.darwin_17.x86_64.tbz2 from http://nue.de.packages.macports.org/difftastic
--->  Attempting to fetch difftastic-0.46.0_0.darwin_17.x86_64.tbz2 from http://mse.uk.packages.macports.org/difftastic
--->  Fetching distfiles for difftastic
--->  Verifying checksums for difftastic
--->  Extracting difftastic
--->  Configuring difftastic
--->  Building difftastic
Error: Failed to build difftastic: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_difftastic/difftastic/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there is a bug.
Error: Processing of port difftastic failed