[PATCH] Update User Documentation for Host setup for Linux

[Vaibhav Gupta]

Mention the requirement of 'pax' package for building BSP if RTEMS is configured with '--enable-tests' option, else build fails.
---
 user/hosts/posix.rst  | 5 +++++
 user/tools/tester.rst | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/user/hosts/posix.rst b/user/hosts/posix.rst
index 063ebe2..bcc2646 100644
--- a/user/hosts/posix.rst
+++ b/user/hosts/posix.rst
@@ -40,6 +40,11 @@ control of the machine. We call this project sandboxing and
 Linux
 -----
 
+BSP Build will require ``pax`` package if RTEMS is configured with
+``--enable-tests`` option, see :ref:`BuildingRTEMSTests`. This package is not
+installed , by default, on many Linux distributions, you can check for it
+using your package manager. Install it, if it is not present on your system. 
+
 A number of different Linux distrubutions are known to work. The following have
 been tested and report as working.
 
diff --git a/user/tools/tester.rst b/user/tools/tester.rst
index 09d07ac..967016e 100644
--- a/user/tools/tester.rst
+++ b/user/tools/tester.rst
@@ -68,6 +68,8 @@ There is the ``erc32`` tester which uses the GDB back-end and the
 how to use :program:`rtems-test` command with the erc32 BSP because it is easy
 to build an use.
 
+.. _BuildingRTEMSTests:
+
 Building RTEMS Tests
 --------------------
 
-- 
2.20.1