git checkout

 To update a git checkout e.g. guider-fix9 (don't care about local changes after git pull)

So for example after a git clone and git checkout of guider-fix9:

git pull

git reset --hard origin/guider-fix9

then in build/kstars the usual:

cmake .

make -j4 kstars

(from e.g. cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug ~/projects-hy/kstars)