I tried to use /build/build.php to compile changes in LESS file and got the following warning messages:

~/www/joomla-cms/build$ php build.php
Start build for version 3.5.0-beta.
Delete old release folder.
Copy the files from the git repository.
fatal: Not a valid object name
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
Copy manifest file to root directory for install packages.
cp: cannot stat ‘~/www/joomla-cms/build/tmp/3.5.0-beta/administrator/manifests/files/joomla.xml’: No such file or directory
Create list of changed files from git repository.
Delete folders not included in packages.
Build full package files.
mv: cannot stat ‘administrator/manifests/packages/pkg_weblinks.xml’: No such file or directory
tar: *: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors
tar: *: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors
Build full update package.
rm: cannot remove ‘installation’: No such file or directory
rm: cannot remove ‘images/banners’: No such file or directory
rm: cannot remove ‘images/headers’: No such file or directory
rm: cannot remove ‘images/sampledata’: No such file or directory
rm: cannot remove ‘images/joomla_black.png’: No such file or directory
rm: cannot remove ‘images/powered_by.png’: No such file or directory
mv: cannot stat ‘../pkg_weblinks.xml’: No such file or directory
tar: *: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors
tar: *: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors
Build of version 3.5.0-beta complete!