For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:rust/openSUSE_Tumbleweed/devel:languages:rust.repo
zypper refresh
zypper install mdbook
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:rust/openSUSE_Factory_ARM/devel:languages:rust.repo
zypper refresh
zypper install mdbook
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:rust/15.6/devel:languages:rust.repo
zypper refresh
zypper install mdbook
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:rust/15.5/devel:languages:rust.repo
zypper refresh
zypper install mdbook
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:rust/15.4/devel:languages:rust.repo
zypper refresh
zypper install mdbook
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:rust/15.3/devel:languages:rust.repo
zypper refresh
zypper install mdbook