Fix openSUSE command and add openSUSE section

Fix the name of the borgbackup package in openSUSE and
add an openSUSE section on how to install development dependencies
to build borgbackup from sources.

(cherry picked from commit 6c7b9a338cda898c829476ef93c4d449d1923671)

docs/installation.rst

@@ -62,6 +62,9 @@ FreeBSD      `FreeBSD ports`_                              ``cd /usr/ports/archi
 Mageia       `cauldron`_                                   ``urpmi borgbackup``
 NetBSD       `pkgsrc`_                                     ``pkg_add py-borgbackup``
 NixOS        `.nix file`_                                  N/A
+OpenBSD      `OpenBSD ports`_                              ``pkg_add borgbackup``
+OpenIndiana  `OpenIndiana hipster repository`_             ``pkg install borg``
+openSUSE     `openSUSE official repository`_               ``zypper in borgbackup``
 OS X         `Brew cask`_                                  ``brew cask install borgbackup``
 Raspbian     `Raspbian testing`_                           ``apt install borgbackup``
 Ubuntu       `Ubuntu packages`_, `Ubuntu PPA`_             ``apt install borgbackup``
@@ -255,6 +258,20 @@ Install the dependencies with development headers::
     sudo dnf install gcc gcc-c++
     sudo dnf install fuse-devel fuse pkgconfig         # optional, for FUSE support
 
+openSUSE Tumbleweed / Leap
+++++++++++++++++++++++++++
+
+Install the dependencies automatically using zypper::
+
+    sudo zypper source-install --build-deps-only borgbackup
+
+Alternatively, you can enumerate all build dependencies in the command line::
+
+    sudo zypper install python3 python3-devel \
+    libacl-devel liblz4-devel openssl-devel \
+    python3-Cython python3-Sphinx python3-msgpack-python \
+    python3-pytest python3-setuptools python3-setuptools_scm \
+    python3-sphinx_rtd_theme python3-llfuse gcc gcc-c++
 
 Mac OS X
 ++++++++