Comment # 8 on bug 1223892 from Paolo Stivanin

It's working fine for me:

$ osc build --clean --alternative-project home:rguenther:nextgcc standard
....
[  368s] Check time report (>1% & >0.1s):
[  368s]     Check                            Duration (in s)   Fraction (in %)
 Checked files
[  368s]     BinariesCheck                                5.5              57.1 
[  368s]     ExtractRpm                                   1.6              16.4 
[  368s]     SignatureCheck                               0.5               5.5 
[  368s]     FilesCheck                                   0.5               5.4 
[  368s]     BashismsCheck                                0.4               4.2 
[  368s]     SharedLibraryPolicyCheck                     0.4               3.8 
[  368s]     BuildRootAndDateCheck                        0.3               3.3 
[  368s]     FilelistCheck                                0.1               1.3 
[  368s]     TOTAL                                        9.6             100.0 
[  368s] 
[  368s]  8 packages and 0 specfiles checked; 14 errors, 4 warnings, 295
filtered, 110 badness; has taken 9.8 s 
[  368s] 
[  368s] ... running 01-delete-x86_64-subarches
[  368s] 
[  368s] suse-ws finished "build gimp.spec" at Mon Jun 10 06:18:12 UTC 2024.
[  368s] 

/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/SRPMS/gimp-2.10.38-0.src.rpm

/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/noarch/gimp-lang-2.10.38-0.noarch.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/libgimp-2_0-0-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-plugins-python-debuginfo-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-debugsource-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-devel-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-plugin-aa-debuginfo-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-plugins-python-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/libgimpui-2_0-0-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/libgimp-2_0-0-debuginfo-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/libgimpui-2_0-0-debuginfo-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-plugin-aa-2.10.38-0.x86_64.rpm
/var/tmp/build-root/standard-x86_64/home/abuild/rpmbuild/RPMS/x86_64/gimp-debuginfo-2.10.38-0.x86_64.rpm