csound fails to build [El Capitan 10.11.6]

[Many-Days]

Hello,

I try to build csound (to use with solfege) but the compilation fails:

---> Building csound Error: Failed to build csound: command execution failed Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_audio_csound/csound/main.log for details. Error: Follow ​https://guide.macports.org/#project.tickets to report a bug. Error: Processing of port csound failed

Here is the tail of the log file:

:info:build CONFIGURATION DECISION: Using GNU gettext scheme :info:build CONFIGURATION DECISION: Using single-precision floating point for audio samples. :info:build Mac OS X version 10.11 :info:build KeyError: 11: :info:build File "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_audio_csound/csound/work/Csound5.16.6/SConstruct", line 600: :info:build sysPyVers = OSXSystemPythonVersions[OSXvers] :info:build Command failed: cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_audio_csound/csound/work/Csound5.16.6" && /opt/local/bin/scons -j4 prefix=/opt/local CC=/usr/bin/clang CXX=/usr/bin/clang++ usePortAudio=0 usePortMIDI=0 useJack=0 useFLTK=1 buildCsound5GUI=1 buildRelease=1 dynamicCsoundLibrary=1 instdir=/opt/local/var/macports/build _opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_audio_csound/csound/work/destroot install=0 :info:build Exit code: 2 :debug:build Error code: CHILDSTATUS 44044 2 :debug:build Backtrace: command execution failed :debug:build while executing :debug:build "system {*}$notty {*}$nice $fullcmdstring" :debug:build invoked from within :debug:build "command_exec build" :debug:build (procedure "portbuild::build_main" line 8) :debug:build invoked from within :debug:build "$procedure $targetname" :error:build See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_audio_csound/csound/main.log for details.

Can anyone help me?

Thanks!