apps: Remove gpsd as dependency in favor of manual installation

This also adds supporting code to handle the presence of these
applications or lack thereof.

Change-Id: If104e5e0be211e596c5d3b68510a11d5dd171914
diff --git a/docs/install.rst b/docs/install.rst
index 1ff8399..90bcc58 100644
--- a/docs/install.rst
+++ b/docs/install.rst
@@ -239,4 +239,12 @@
 
 - ``2024-08``: ndn-cxx 0.9.0, NFD 24.07, NLSR 24.08, PSync 0.5.0,
   ndn-tools 24.07, and compatible versions of ndn-traffic-generator
-  and infoedit.
\ No newline at end of file
+  and infoedit.
+
+Using gpsd (Experimental)
+----------------
+
+The gpsd application included currently is based on in-progress work and
+is not treated as part of the main dependencies. To use it, install the
+`gpsd` and `nc` (netcat) from your package manager, if not already present,
+to enable the functionality.
\ No newline at end of file