[MacPorts] #54331: libass-0.13.7 not building on macOS 10.12.5 + Xcode 8.

[MacPorts]

#54331: libass-0.13.7 not building on macOS 10.12.5 + Xcode 8.
------------------------------+--------------------
 Reporter:  ssisak            |      Owner:
     Type:  defect            |     Status:  new
 Priority:  Normal            |  Milestone:
Component:  ports             |    Version:  2.4.1
 Keywords:  libass universal  |       Port:  libass
------------------------------+--------------------
 libass is failing to build on current macOS+Xcode -- I'll update ticket as
 I figure it out, but here's the problem section of the log (missing
 dependency on libreadline)?

 {{{
 checking for fontconfig >= 2.10.92... yes
 checking for CORETEXT... yes
 checking for DIRECTWRITE... no
 checking whether make supports nested variables... (cached) yes
 checking that generated files are newer than configure... done
 configure: creating ./config.status
 config.status: creating Makefile
 dyld: Library not loaded: /opt/local/lib/libreadline.6.dylib
   Referenced from: /opt/local/bin/gawk
   Reason: image not found
 sed: stdout: Broken pipe
 ./config.status: line 1229: 34241 Done(1)                 eval sed
 \"\$ac_sed_extra\" "$ac_file_inputs"
      34242 Abort trap: 6           | $AWK -f "$ac_tmp/subs.awk" >
 $ac_tmp/out
 config.status: error: could not create Makefile
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_libass/libass/work/libass-0.13.7-x86_64"
 && ./configure --prefix=/opt/local --disable-dependency-tracking --enable-
 fontconfig --disable-harfbuzz --disable-silent-rules --disable-dependency-
 tracking --host=x86_64-apple-darwin16.6.0 --enable-asm
 Exit code: 1
 Error: Failed to configure libass, consult
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_libass/libass/work/libass-0.13.7-x86_64/config.log
 Error: Failed to configure libass: configure failure: command execution
 failed
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_multimedia_libass/libass/main.log
 for details.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/54331>
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