How to install magus-gtk2 on SuSE9.2 from the source-RPMs
(might also work for Redhat or other RPM-based systems):

IMPORTANT: Due to a bug in the postgresql-devel-7.4.5-6 package of SuSE9.2,
           it is necessary to make a symbolic link manually after installing
           that package and before compiling MAGUS.
           You can do this (as root) with the following command:

( cd /usr/include/pgsql/internal && ln -s ../server/getaddrinfo.h . )

1. First copy the packed sources and patches into /usr/src/packages/SOURCES/
   and the magus*.spec file into /usr/src/packages/SPECS/.
   This happens automatically if you install the source package.
2. Go into /usr/src/packages/SPECS/
3. Create the binary and developments packages with the command
     rpmbuild --target i586 -bb magus*.spec
   [On older rpm versions "rpmbuild" does not exist: use "rpm" instead.]
   You can of course replace i586 also by i386, i486, i686, or athlon,
   depending on the architecture for the binary package.
   The binary and development packages will be generated in
   /usr/src/packages/RPMS/i586/
   (the output should contain a corresponding text near the end).
   If this step is not successfull, see TROUBLESHOOTING below.
   After successfull execution do *not* delete the temporary data,
   but continue with the next steps instead:
4. [Optional] If you want a package built as "root" (which does not contain
   your user name in the file permissions) you should *not* run 3. as root
   but instead get the program "fakeroot" and run as a next step
     fakeroot rpmbuild --target i586 --define "fake 1" -bb magus*.spec
   The option `--define "fake 1"' means that *only* the install portion
   of the previous step is repeated (as a faked root).
   This might only work with newer versions of rpmbuild.
5. Create the "noarch" data package with the command
     [fakeroot] rpmbuild --target noarch -bb magus*.spec
   This will only work properly if you have successfully done step 4.
   The package will be created in /usr/src/packages/RPM/noarch/.
6. [optional] Delete the temporary data in /usr/src/packages/BUILD,
   e.g. with
     rpmbuild --clean magus*.spec
   and delete the sources and patches from /usr/src/packages/SOURCES
   and this patch file from /usr/src/packages/SPECS
7. [optional] Create the source package with the command
     rpmbuild -bs magus*.spec
   The source package will be created in /usr/src/packages/SRPM.
8. [optional] Delete sources and patches from /usr/srcpackage/SOURCE
   and this patch file from /usr/src/packages/SPECS e.g. with
     rpmbuild --rmsource --rmspec magus*.spec
9. [optional] Install the packages as root with
     rpm -U binary_package data_package
   where, of course, binary_package and data_package have to be replaced
   by the corresponding (relative or absolute) paths to the generated
   packages.
   Note that you should either specify both packages in one command as above
   or first install data_package.

TROUBLESHOOTING:

If step 3 is not successfull, this can have many different reasons.
Most probably, you need to install some package (probably some *-devel
package) from your distribution.
To find out which package is missing, look for the error messages to
guess at least parts of the missing filename and find out the
correpesponding package with the "pin" command (you have to install
the pin package, of course, to do so).
A good candidate for a missing package is postgresql-devel.
If the compiler stops with "killed" this is probably actually an
"out of memory" error - be sure to have sufficient swap space and
not to run other processes (close KDE or even X if necessary):
I experienced that 320 MB total space are the lower limit of memory.