[MacPorts] #66485: While I am installing port 1 I cannot build port 2

[MacPorts]

#66485: While I am installing port 1 I cannot build port 2
--------------------------+--------------------
  Reporter:  ballapete    |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.8.0
Resolution:               |   Keywords:
      Port:               |
--------------------------+--------------------

Comment (by ballapete):

 But I am not:

 {{{
 sudo port -vds build diffutils
 Password:
 DEBUG: Changing to port directory:
 /opt/local/var/macports/sources/nue.de.rsync.macports.org/macports/release/tarballs/ports/sysutils/diffutils
 DEBUG: OS darwin/8.11.0 (macOS 10.4.11) arch powerpc
 DEBUG: Sourcing PortGroup compiler_blacklist_versions 1.0 from
 /opt/local/var/macports/sources/nue.de.rsync.macports.org/macports/release/tarballs/ports/_resources/port1.0/group/compiler_blacklist_versions-1.0.tcl
 DEBUG: compiler clang blacklisted because it's not installed or it doesn't
 work
 DEBUG: adding the default universal variant
 DEBUG: Reading variant descriptions from
 /opt/local/var/macports/sources/nue.de.rsync.macports.org/macports/release/tarballs/ports/_resources/port1.0/variant_descriptions.conf
 DEBUG: Running callback portconfigure::add_automatic_compiler_dependencies
 DEBUG: Chosen compiler apple-gcc-4.2 is provided by a port, adding
 dependency
 DEBUG: Adding depends_build port:apple-gcc42
 DEBUG: Adding depends_skip_archcheck apple-gcc42
 DEBUG: Finished running callback
 portconfigure::add_automatic_compiler_dependencies
 DEBUG: Running callback portbuild::add_automatic_buildsystem_dependencies
 DEBUG: Finished running callback
 portbuild::add_automatic_buildsystem_dependencies
 DEBUG: Running callback portstartupitem::add_notes
 DEBUG: Finished running callback portstartupitem::add_notes
 DEBUG: Attempting ln -sf
 /opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_sysutils_diffutils/diffutils/work
 /opt/local/var/macports/sources/nue.de.rsync.macports.org/macports/release/tarballs/ports/sysutils/diffutils/work
 DEBUG: dropping privileges: euid changed to 502, egid changed to 502.
 DEBUG: Starting logging for diffutils @3.8_0
 DEBUG: Mac OS X 10.4.11 (darwin/8.11.0) arch powerpc
 DEBUG: MacPorts 2.8.0
 DEBUG: Xcode 2.5, CLT none
 DEBUG: SDK 10.4
 DEBUG: MACOSX_DEPLOYMENT_TARGET: 10.4
 Waiting for lock on /opt/local/var/macports/registry/.registry.lock
 }}}

 In one instance of GNU Emacs `pango` is being built in `some variant for
 installation`, in another instance of GNU Emacs I wanted to build again
 `diffutils`. There are no obvious remote dependencies, because then second
 `port` would try to build `pango` which is not installed right now.

-- 
Ticket URL: <https://trac.macports.org/ticket/66485#comment:2>
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