tvision permissions screw up builds

tvision/Makefile

@@ -15,6 +15,7 @@ impl:
 	cmake --build ./build && \
 	pushd build && \
 	make install
+	chown 997:997 tvision -R  # workaround for not using non-root user for building
 
 package-ubuntu2004:
 	rm -rf out