我正在使用zypper安装rpm-build但遇到问题：
zypper install rpm-build
Loading repository data...
Reading installed packages...
Resolving package dependencies...
The following 4 NEW packages are going to be installed:
gettext-tools liblua5_3 rpm-build systemd-rpm-macros
The following 4 packages are going to be upgraded:
gettext-runtime liblzma5 rpm rpm-python
The following 8 packages are not supported by their vendor:
gettext-runtime gettext-tools liblua5_3 liblzma5 rpm rpm-build rpm-python systemd-rpm-macros
4 packages to upgrade, 4 new.
Overall download size: 4.6 MiB. Already cached: 0 B. After the operation, additional 8.4 MiB will be used.
Continue? [y/n/? shows all options] (y): y
Retrieving package systemd-rpm-macros-3-5.30.noarch (1/8), 11.7 KiB ( 12.1 KiB unpacked)
Media source 'http://download.opensuse.org/tumbleweed/repo/oss/' does not contain the desired medium
Abort, retry, ignore? [a/r/i/? shows all options] (a): a
Problem occured during or after installation or removal of packages:
Installation aborted by user
我尝试过更改包的优先级，但仍然面临问题：
zypper lr -d
# | Alias | Name | Enabled | GPG Check | Refresh | Priority | Type | URI | Service
--+----------+----------+---------+-----------+---------+----------+-------- +--------------------------------------------------------+--------
1 | n_update | n_update | Yes | (r ) Yes | No | 99 | rpm-md | http://download.opensuse.org/update/leap/42.2/non-oss/ |
2 | non-oss | non-oss | Yes | ( p) Yes | No | 99 | yast2 | http://download.opensuse.org/tumbleweed/repo/non-oss/ |
3 | oss | oss | Yes | (r ) Yes | No | 99 | yast2 | http://download.opensuse.org/tumbleweed/repo/oss/ |
4 | src-oss | src-oss | Yes | (r ) Yes | No | 99 | yast2 | http://download.opensuse.org/tumbleweed/repo/src-oss |
5 | update | update | Yes | (r ) Yes | No | 99 | rpm-md | http://download.opensuse.org/update/tumbleweed/ |