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-rw-r--r--libraries/opencv/README4
1 files changed, 4 insertions, 0 deletions
diff --git a/libraries/opencv/README b/libraries/opencv/README
index 41d3700760..9e878dc8af 100644
--- a/libraries/opencv/README
+++ b/libraries/opencv/README
@@ -33,6 +33,10 @@ environment variable:
CVGDAL=yes ./opencv.SlackBuild
(to support SBo's gis/gdal)
+Access to patented algorithms e.g.SIFT/SURF may be enabled by setting
+the CVNONFREE environment variable:
+ CVNONFREE=yes ./opencv.SlackBuild
+
Please note that some combinations of options may not be possible. In
particular, if both qt5 and VTK are installed on the host build system,
VTK support will be disabled unless it was built with qt5 support (which