docs+build: Fix build on Ubuntu 16.04
python-sphinx on Ubuntu 16.04 requires `master_doc` to exist, otherwise
failing the build of manpages, even though this `master_doc` is never
used in manpages.
Change-Id: I8252cd8d24cfcc0403fdf551519944692e206380
diff --git a/manpages/conf.py b/manpages/conf.py
index d86777a..913f0c8 100644
--- a/manpages/conf.py
+++ b/manpages/conf.py
@@ -1,6 +1,8 @@
# General information about the project.
project = u'NDN Essential Tools'
+master_doc = 'index'
+
# -- Options for manual page output ---------------------------------------
# One entry per manual page. List of tuples
diff --git a/manpages/index.rst b/manpages/index.rst
new file mode 100644
index 0000000..d76db17
--- /dev/null
+++ b/manpages/index.rst
@@ -0,0 +1,8 @@
+.. toctree::
+ ndn-dissect
+ ndn-pib
+ ndndump
+ ndnpeek
+ ndnping
+ ndnpingserver
+ ndnpoke