Problem: CVS RPM package relocation incomplete

[Martin Roehrig]

I tried to make a RPM package from the CVS 1.11.2 sources and was mostly
successfull without problems.

However playing around a bit I found that it is not fully relocatable, as the
paths used in the %post and %preun install time scripts are fixed to the
location where they where at *build* time (of the package), even if I use a
different --prefix option at *install* time.

Here is the part of the spec file I'm refering to:

  %post
  /sbin/install-info /%{_infodir}/cvs.info.gz /%{_infodir}/dir
  /sbin/install-info /%{_infodir}/cvsclient.info.gz /%{_infodir}/dir

  %preun
  if [ $1 = 0 ]; then
  # uninstall the info reference in the dir file
  /sbin/install-info --delete /%{_infodir}/cvs.info.gz /%{_infodir}/dir
  /sbin/install-info --delete /%{_infodir}/cvsclient.info.gz /%{_infodir}/dir
  fi

Apparently the problem is that %{_infodir} is only a build time macro and
therefore these paths are fixed after the package is built and RPMs path
substitution works only on the %files section, not on the install scripts.

I read the whole Maximum RPM document (by RedHat) and some other material but
obviously I am not yet experienced enough in RPM package building to imagine a
solution to that problem.

Is there somebody who could give me a hint how to fix that?

Best regards
Martin