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 SIP SIMPLE SDK installation on Linux
 ------------------------------------
 
 Home page: http://sipsimpleclient.org
 
 
 This document described the installation procedure on 
 Linux operating systems.
 
 
 Step 1. Prerequisites
 ---------------------
 
 Install the C compiling environment, Python3 and the development version
 for the following packages:
 
  * openssl
  * ffmpeg
 
 
 Step 2. Install system dependencies
 -----------------------------------
 
 SIP SIMPLE SDK depends upon the following third party sources:
 
 - PJSIP base revision 210 from 2020-02-14
   https://github.com/pjsip/pjproject/archive/2.10.tar.gz
 
 - ZRTP tag 6b3cd8e6783642292bad0c21e3e5e5ce45ff3e03
   https://github.com/wernerd/ZRTPCPP.git
 
 
 Fetch and patch the dependencies using ./get_dependencies.sh script
 
 See Dependencies.txt for detailed description of the required libraries and
 their minimum version number.
 
 Use the appropriate package manager for your Linux distribution to install
 the following packages, notice the minimum version numbers.
 
 Using pip3 inside your user environment:
 
 pip3 install --user cython==0.29.37 dnspython lxml twisted python-dateutil \
-greenlet zope.interface requests gmpy2 wheel
+greenlet zope.interface requests gmpy2 wheel gevent
 
 
 Step 3. Install AG Projects dependencies
 ----------------------------------------
 
  - python3-application
  - python3-eventlib
  - python3-gnutls
  - python3-otr
  - python3-msrplib
  - python3-xcaplib
 
 For each of them, in the exact order as listed above, retrieve the packages
 as follows:
 
 Using darcs:
 
 darcs clone http://devel.ag-projects.com/repositories/PROJECT
 
 replace PROJECT with each of the names above
 
 As tar archives from:
 
 http://download.ag-projects.com/SipSimpleSDK/Python3/
 
 Install these packages by going into each directory.
 
 Using pip3 inside your user environment:
 
 pip3 install --user .
 
 System-wide using setup.py:
 
 sudo python3 setup.py install
 
 As a debian package:
 
 ./makedeb.sh
 
 The debian package can be found inside ./dist folder
 
 sudo dpkg -i *.deb
 
 
 Step 4. Install the SDK
 -----------------------
 
 Using pip3 inside your user environment:
 
 pip3 install --user .
 
 System-wide using setup.py:
 
 sudo python3 setup.py install
 
 As a debian package:
 
 ./makedeb.sh
 
 The debian package can be found inside ./dist folder
 
 sudo dpkg -i *.deb
 
 
 Step 5. Testing the SDK
 -----------------------
 
 Use the command line tools provided by sipclients3 package, the executables
 start with sip- prefix.