.. _troubleshooting_poco_not_found:

7.3 Build Error: Poco Not Found
====================================

A. Error Case
-------------

During build, the link step fails with undefined references to ``Poco::`` symbols.

B. Root Cause Analysis
----------------------

The **Poco C++ Libraries** are missing from your system, or ``-lPocoNet -lPocoFoundation`` is missing from the link line.

C. Solution
-----------

Install the dependency manually:

.. code-block:: bash

   sudo apt install libpoco-dev

Then re-run CMake:

.. code-block:: bash

   cd build && cmake .. && make

If Poco is installed, add ``-lPocoNet -lPocoFoundation`` after ``libDRFL.a`` on the link line (see :ref:`Linking Library <Linking_Library>`).