Improve build instructions

Ran into this when building a docker image.

diff --git a/README.rst b/README.rst
index 0f54416f14ebbc92851b8f3cd201f4d0a1ece60e..6541afc7afed337f6bd41d01ce7ed4b16557136a 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -87,7 +87,7 @@ you can run configure::
        $ make
        $ make install
 
-Additional packages required: autoconf, automake, libtool,
+Additional packages required: autoconf, automake, libevent-dev, libtool,
 autoconf-archive, python-docutils, and pkg-config.
 
 Building for WIN32