virtualbox @@4.1.20 build error

[edhem.bajric@…]

Dear all

Performing a upgrade of outdated ports, I am facing the following problem.

--->  Attempting to fetch VirtualBox-4.1.20.tar.bz2 from http://lil.fr.distfiles.macports.org/virtualbox
--->  Verifying checksum(s) for virtualbox
--->  Extracting virtualbox
--->  Applying patches to virtualbox
--->  Configuring virtualbox
--->  Building virtualbox
Error: org.macports.build for port virtualbox returned: command execution failed
Please see the log file for port virtualbox for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/main.log
Error: Unable to upgrade port: 1
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets

The main.log-file is attatched to this ticket. Before I performed this upgrade, I performed the commands

sudo port -vds sync
sudo port -vds selfupdate

with success.

[ryandesign (Ryan Carsten Schmidt)]

Please remember to fill in the Port field and to use WikiFormatting.

The log says:

:info:build kmk: *** No rule to make target `/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/lib/libpython2.7.dylib', needed by `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/work/VirtualBox-4.1.20/out/darwin.x86/release/obj/VBoxPython2_7/VBoxPython2_7.so'.  Stop.

So this is a duplicate of #35808.