[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
 Keywords:               |       Port:
-------------------------+--------------------
 Modern Macs have more than one CPU core so that it is possible to perform
 a few things in parallel. But port is very old fashioned and prevents
 building and installing one software and ''just'' building another one
 that is not depending on the software that is being built to become
 installed. Why? What is the sense? I do understand that it can be hard to
 record in a DB when two installation run at the same time, but here just
 one build step for a future installation is going on and I want to save
 some time by performing another build. Nothing to be tracked, or?

 {{{
 tiger:~ root# nice port rdeps diffutils
 The following ports are dependencies of diffutils @3.8_0:
   xz
     lbzip2
       apple-gcc42
         ld64
           ld64-97
             libmacho-headers
             libunwind-headers
         cctools
         gcc_select
       legacy-support
     gettext
       libiconv
         gperf
       libtextstyle
         ncurses
       gettext-runtime
       gettext-tools-libs
 }}}

 Curl is being being built for installation…

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Ticket URL: <https://trac.macports.org/ticket/66485>
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