kdenlive @0.9.10: error: call to 'abs' is ambiguous

[Chadzilla]

$ sudo port install kdenlive
--->  Computing dependencies for kdenlive
--->  Fetching archive for kdenlive
--->  Attempting to fetch kdenlive-0.9.10_3.darwin_17.x86_64.tbz2 from https://packages.macports.org/kdenlive
--->  Attempting to fetch kdenlive-0.9.10_3.darwin_17.x86_64.tbz2 from http://ywg.ca.packages.macports.org/mirror/macports/packages/kdenlive
--->  Attempting to fetch kdenlive-0.9.10_3.darwin_17.x86_64.tbz2 from http://mse.uk.packages.macports.org/sites/packages.macports.org/kdenlive
--->  Fetching distfiles for kdenlive
--->  Verifying checksums for kdenlive
--->  Extracting kdenlive
--->  Applying patches to kdenlive
--->  Configuring kdenlive
--->  Building kdenlive
Error: Failed to build kdenlive: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_kdenlive/kdenlive/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port kdenlive failed

[Chadzilla]

log file

[ryandesign (Ryan Carsten Schmidt)]

We've seen similar errors with many other ports. Something about the new version of clang in the new version of Xcode that doesn't like this code that was previously accepted. See other tickets for how we've fixed it in other ports.