[3/3] kudu git commit: KUDU-1822. Update docs to build the documentation in ubuntu

[to...@apache.org]

KUDU-1822. Update docs to build the documentation in ubuntu

Include two packages, gem and ruby-dev, in the instruction to
build documentations for Ubutnu.

Change-Id: I474a0ffd61b4c50b0c0b5885a4e615679b4ae630
Reviewed-on: http://gerrit.cloudera.org:8080/5608
Tested-by: Kudu Jenkins
Reviewed-by: Todd Lipcon <to...@apache.org>
(cherry picked from commit bdd8e484d48b927f56b1379abddb2568cac47941)
Reviewed-on: http://gerrit.cloudera.org:8080/5696
Tested-by: Todd Lipcon <to...@apache.org>


Project: http://git-wip-us.apache.org/repos/asf/kudu/repo
Commit: http://git-wip-us.apache.org/repos/asf/kudu/commit/58aa4ea0
Tree: http://git-wip-us.apache.org/repos/asf/kudu/tree/58aa4ea0
Diff: http://git-wip-us.apache.org/repos/asf/kudu/diff/58aa4ea0

Branch: refs/heads/branch-1.2.x
Commit: 58aa4ea08e21962aa2357487c6c1a4efd9f2d138
Parents: e8d9c6b
Author: Jun He <ju...@gmail.com>
Authored: Thu Jan 5 00:44:11 2017 -0800
Committer: Todd Lipcon <to...@apache.org>
Committed: Thu Jan 12 20:32:43 2017 +0000

----------------------------------------------------------------------
 docs/installation.adoc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/kudu/blob/58aa4ea0/docs/installation.adoc
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diff --git a/docs/installation.adoc b/docs/installation.adoc
index d154a44..e66f8c5 100644
--- a/docs/installation.adoc
+++ b/docs/installation.adoc
@@ -370,7 +370,7 @@ $ sudo apt-get install autoconf automake curl g++ gcc gdb git \
 . Optional: Install additional packages to build the documentation
 +
 ----
-$ sudo apt-get install xsltproc zlib1g-dev
+$ sudo apt-get install xsltproc zlib1g-dev gem ruby-dev
 ----
 
 . Clone the Git repository and change to the new `kudu` directory.