diff --git a/gis/opencpn/README b/gis/opencpn/README
index 8ebae45b1e..1c6dfc8736 100644
--- a/gis/opencpn/README
+++ b/gis/opencpn/README
@@ -3,5 +3,9 @@ plotter and navigation software, for use underway or as a planning
 tool. OpenCPN is developed by a team of active sailors using real
 world conditions for program testing and refinement.
 
-wxGTK is a required dependency, however you can use wxGTK3 or
-wxPython instead of wxGTK if you prefer.
+wxGTK3 is a required dependency, however you can use wxGTK or
+wxPython instead if you prefer.  If decide to use wxGTK you will
+have to recompile wxGTK with the --enable-graphics_ctx option
+because it is not enabled in the default slackbuild and is
+required by opencpn.  The --enable-graphics_ctx option is enabled
+by default in the wxGTK3 and wxPython slackbuilds.
diff --git a/gis/opencpn/opencpn.info b/gis/opencpn/opencpn.info
index eee1daeb10..4c991832aa 100644
--- a/gis/opencpn/opencpn.info
+++ b/gis/opencpn/opencpn.info
@@ -5,6 +5,6 @@ DOWNLOAD="https://github.com/OpenCPN/OpenCPN/archive/v4.4.0.tar.gz"
 MD5SUM="d991b49373c45f9756fa79c3b3a0f215"
 DOWNLOAD_x86_64=""
 MD5SUM_x86_64=""
-REQUIRES="gpsd tinyxml libmspack portaudio wxGTK"
+REQUIRES="gpsd tinyxml libmspack portaudio wxGTK3"
 MAINTAINER="M.Dinslage"
 EMAIL="daedra1980@gmail.com"