In the past, several changes were made to the packages of the listed projects,
including the removal of the line "BuildRoot:".

As this is used by many *.spec files (398 out of 547 existing):

osc co windows:mingw:win32
cd windows:mingw:win32
find -maxdepth 2 -type f -name '*.spec' -exec grep -Hn "BuildRoot:" {} \; | wc
-l
398
find -maxdepth 2 -type f -name '*.spec' | wc -l
547

it could save the packagers time to do this removal as a bulk change with:

osc co windows:mingw:win32
cd windows:mingw:win32
find -maxdepth 2 -type f -name '*.spec' -exec gawk -i inplace '$1 ==
"BuildRoot:" { getline } { print $0}' {} \;
osc ci -m "Drop BuildRoot:"