libyaml from systemsmanagement:saltstack:products project
Select Your Operating System
Add repository and install manually
For SLE 11 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/systemsmanagement:saltstack:products/SLE_11_SP4/systemsmanagement:saltstack:products.repo zypper refresh zypper install libyaml