[MacPorts] #66283: MacPorts installs a faulty compilers-1.0.tcl file on PPC Tiger, Mac OS X 10.4.11

[MacPorts]

#66283: MacPorts installs a faulty compilers-1.0.tcl file on PPC Tiger, Mac OS X
10.4.11
-----------------------+----------------------
 Reporter:  ballapete  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.8.0
 Keywords:  tiger ppc  |       Port:  MacPorts
-----------------------+----------------------
 `boost176` could not be built because a dozen or more times
 `-Wl,-rpath,/opt/local/lib/libgcc` is passed to `ld` although it's known
 that on `Tiger` this does not work, see #65867. After some time I realised
 that the cause for the repeated faults is in the build system, via one of
 the included `PortGroup`s. So I started to change `compilers-1.0.tcl`
 files, see below:

 {{{
 -rw-r--r--   1 root  x11    31485 16 Nov 23:03
 /opt/local/var/macports/sources/nue.de.rsync.macports.org/macports/release/tarballs/ports/_resources/port1.0/group/compilers-1.0.tcl
 -rw-r--r--   1 root  admin  30243 16 Nov 22:31
 /opt/local/var/macports/registry/portgroups/d0cf92b7e597517dcb1fc9ec40ac4d930855baa25e0198ecb05bdd3471c04584-30309/compilers-1.0.tcl
 -rw-r--r--   1 root  admin  29895 21 Apr  2022
 /opt/local/var/macports/registry/portgroups/ebfc4fd7146e39c2055b915a303f8cc3ce9bc8b07993fcb3342bf2ad2903f6bb-29895/compilers-1.0.tcl
 -rw-r--r--   1 root  admin  29542 21 Jun  2021
 /opt/local/var/macports/registry/portgroups/fdaf8a4848353f3177ce73946b3e062f5420bc49a55624bd3c3f2d46a5b82b3a-29542/compilers-1.0.tcl
 }}}

 I finally succeed and `boost176` could be built overnight.

 How can I remove old and unnecessary portgroups files?

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Ticket URL: <https://trac.macports.org/ticket/66283>
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