diff --git a/lib/kross/configure.in.in b/lib/kross/configure.in.in
index 67e9aaf57..636c4b3a5 100644
--- a/lib/kross/configure.in.in
+++ b/lib/kross/configure.in.in
@@ -14,8 +14,11 @@ fi
 
 # Compile the Kross python plugin only if both, $LIBPYTHON and
 # $PYTHONINC, are defined.
+#
+# WARNING: Building Kross python plugin is now prohibited at all times,
+# because it is not compatible with Python >= 3.
 AM_CONDITIONAL(compile_kross_python,
-               test -n "$LIBPYTHON" && test -n "$PYTHONINC")
+               false && test -n "$LIBPYTHON" && test -n "$PYTHONINC")
 
 ###############################
 # Check for Ruby