updated as per comment

gui/wxpython/docs/wxgui_sphinx/conf.py

@@ -10,8 +10,6 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-import sys
-import os
 from datetime import date
 import string
 from shutil import copy
@@ -20,11 +18,6 @@
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-if not os.getenv("GISBASE"):
-    sys.exit("GISBASE not defined")
-sys.path.insert(
-    0, os.path.abspath(os.path.join(os.environ["GISBASE"], "etc", "python", "grass"))
-)
 
 footer_tmpl = string.Template(
     r"""