path: root/gis/osgEarth/README
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1 files changed, 16 insertions, 2 deletions
diff --git a/gis/osgEarth/README b/gis/osgEarth/README
index ba1b2a6b46..8026af489f 100644
--- a/gis/osgEarth/README
+++ b/gis/osgEarth/README
@@ -5,5 +5,19 @@ OpenSceneGraph application, and go!
osgEarth supports all kinds of data and comes with lots of examples to help you
get up and running quickly and easily.
-Optional requirements protobuf and rocksdb are recommended for enhanced
-performance. They will be used if detected when osgEarth is built.
+Some optional requirements are recommended for enhanced functionality
+and/or performance. They include:
+ osgQt, poco, protobuf, rocksdb
+For all but osgQt, they will be used if detected when osgEarth is built.
+In the case of osgQt, the version of Qt that it was built with is relevant.
+If osgQt was built with Qt5, the environment variable OSGQT=5 must be set when
+running the osgEarth SlackBuild i.e.
+ OSGQT=5 sh osgEarth.SlackBuild
+In this case, the qt5 package is also an additional build requirement.
+If osgQt was built with Qt4 (the standard for Slackware 14.2), set OSGQT=4 i.e.
+ OSGQT=4 sh osgEarth.SlackBuild
+If OSGQT is not set, osgQt support will not be included.