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-rw-r--r--gis/saga-gis/README7
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diff --git a/gis/saga-gis/README b/gis/saga-gis/README
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--- a/gis/saga-gis/README
+++ b/gis/saga-gis/README
@@ -6,8 +6,11 @@ Functions are organised as modules in framework independent Module Libraries
and can be accessed via SAGA's Graphical User Interface or various scripting
environments (shell scripts, Python, R and so on).
-SAGA can use these optional dependencies: libharu, opencv, postgresql and
-qhull. SAGA currently does not build when vigra is installed.
+SAGA can use these optional dependencies: libharu, postgresql and qhull. SAGA
+currently does not build when vigra is installed.
+
+To enable opencv, set OPENCV=ON. By default OpenCV is disabled since SAGA does
+not build when OpenCV version 4 or greater is installed.
If SAGA fails to run after an upgrade, uninstall old versions of SAGA before
compilation.