Erreur lors de la compilation des dépendances - MacOS

[Pascal B.]

Hello,

Je souhaitais compiler la dernière version de dt en suivant à la lettre le BUILD.txt récemment mis à jour sur le Github (https://github.com/darktable-org/darktab.../BUILD.txt).

Les premières étapes se sont bien passées (installation de Macports notamment) mais lors de l'installation des dépendances (commande 'sudo port install git exiv2 libgphoto2 gtk-osx-application-gtk3 lensfun librsvg libsoup openexr json-glib flickcurl GraphicsMagick openjpeg lua webp libsecret pugixml osm-gps-map adwaita-icon-theme tango-icon-theme intltool iso-codes libomp') juste avant l'installation de dt ça plante au niveau de python37 : 
...
--->  Fetching distfiles for python37

--->  Attempting to fetch Python-3.7.5.tar.xz from https://www.python.org/ftp/python/3.7.5/
--->  Verifying checksums for python37
--->  Extracting python37
--->  Applying patches to python37
--->  Configuring python37
--->  Building python37
Error: Failed to build python37: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_python37/python37/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port git failed

Le détail du log donne ceci :
:info:build /bin/sh: line 1: 61371 Killed: 9               DYLD_FRAMEWORK_PATH=/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_python37/python37/work/Python-3.7.5 ./python.exe -E -S -m sysconfig --generate-posix-vars

:info:build generate-posix-vars failed
:info:build make: *** [pybuilddir.txt] Error 1
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_python37/python37/work/Python-3.7.5'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_python37/python37/work/Python-3.7.5" && /usr/bin/make -j8 -w all
:info:build Exit code: 2
:error:build Failed to build python37: command execution failed
:debug:build Error code: CHILDSTATUS 61031 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_macports_release_tarballs_ports_lang_python37/python37/main.log for details.

Mon environnement :
- Catalina 10.15.1 beta 3
- Xcode 11.1

Any idea ?
Merci d'avance.