Getting a second MacPorts into action FAILS

[Marko Käning]

I installed a 2nd MacPorts tree on my system as /opt/macports-test following instructions from section 2.3.4 of the guide.

Selfupdate of the new ports system works fine. There are no errors reported. By default there are no ports installed.

Now I tried to install qt4-mac for a start, but the ports command fails:
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markos-imac:MacPorts-1.9.1 marko$ sudo /opt/macports-test/bin/port install qt4-mac
--->  Computing dependencies for qt4-macError: Internal error: port lookup failed: too many nested evaluations (infinite loop?)
Error: Status 1 encountered during processing.
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Setting -d debug option reveals this at some stage of ports' output:
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markos-imac:MacPorts-1.9.1 marko$ sudo /opt/macports-test/bin/port -d install qt4-mac
DEBUG: Changing to port directory: /opt/macports-test/var/macports/sources/rsync.macports.org/release/ports/aqua/qt4-mac
DEBUG: OS darwin/10.4.0 (Mac OS X 10.6) arch i386
DEBUG: org.macports.load registered provides 'load', a pre-existing procedure. Target override will not be provided
DEBUG: org.macports.unload registered provides 'unload', a pre-existing procedure. Target override will not be provided
DEBUG: org.macports.distfiles registered provides 'distfiles', a pre-existing procedure. Target override will not be provided
DEBUG: Using group file /opt/macports-test/var/macports/sources/rsync.macports.org/release/ports/_resources/port1.0/group/archcheck-1.0.tcl
DEBUG: Using group file /opt/macports-test/var/macports/sources/rsync.macports.org/release/ports/_resources/port1.0/group/qt4-1.0.tcl
DEBUG: Reading variant descriptions from /opt/macports-test/var/macports/sources/rsync.macports.org/release/ports/_resources/port1.0/variant_descriptions.conf
DEBUG: universal variant already exists, so not adding the default one
DEBUG: Executing variant quartz provides quartz
DEBUG: Starting logging for qt4-mac
--->  Computing dependencies for qt4-mac
DEBUG: Searching for dependency: pkgconfig
DEBUG: Didn't find receipt, going to depspec regex for: pkgconfig
DEBUG: Changing to port directory: /opt/macports-test/var/macports/sources/rsync.macports.org/release/ports/devel/pkgconfig
DEBUG: OS darwin/10.4.0 (Mac OS X 10.6) arch i386
DEBUG: org.macports.load registered provides 'load', a pre-existing procedure. Target override will not be provided
DEBUG: org.macports.unload registered provides 'unload', a pre-existing procedure. Target override will not be provided
DEBUG: org.macports.distfiles registered provides 'distfiles', a pre-existing procedure. Target override will not be provided
DEBUG: adding the default universal variant
DEBUG: Reading variant descriptions from /opt/macports-test/var/macports/sources/rsync.macports.org/release/ports/_resources/port1.0/variant_descriptions.conf
DEBUG: Searching for dependency: qt4-mac
DEBUG: Didn't find receipt, going to depspec regex for: qt4-mac
DEBUG: Searching for dependency: zlib
DEBUG: Didn't find receipt, going to depspec regex for: zlib
DEBUG: Changing to port directory: /opt/macports-test/var/macports/sources/rsync.macports.org/release/ports/archivers/zlib
DEBUG: OS darwin/10.4.0 (Mac OS X 10.6) arch i386
DEBUG: org.macports.load registered provides 'load', a pre-existing procedure. Target override will not be provided
DEBUG: org.macports.unload registered provides 'unload', a pre-existing procedure. Target override will not be provided
DEBUG: org.macports.distfiles registered provides 'distfiles', a pre-existing procedure. Target override will not be provided
.
.
.
DEBUG: Checking for conflicts against qt4-mac
DEBUG: Searching for dependency: qt4-mac-devel
DEBUG: Didn't find receipt, going to depspec regex for: qt4-mac-devel
DEBUG: Searching for dependency: pkgconfig
DEBUG: Didn't find receipt, going to depspec regex for: pkgconfig
DEBUG: Searching for dependency: qt4-mac
DEBUG: Didn't find receipt, going to depspec regex for: qt4-mac
DEBUG: Searching for dependency: zlib
DEBUG: Didn't find receipt, going to depspec regex for: zlib
DEBUG: Searching for dependency: dbus
DEBUG: Didn't find receipt, going to depspec regex for: dbus
DEBUG: Searching for dependency: openssl
.
.
.
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Any idea what isn't set up correctly here?