-find Documentation/ -path 'Documentation/snippets' -prune -o \
- -name '*.itely' | xargs $BUILD_DIR/out/bin/convert-ly -e -d
+find Documentation/ -path 'Documentation/snippets' -prune -o -name out -prune \
+ -o -name 'out-*' -prune -o -name '*.itely' -print \
+ | xargs $LILYPOND_BUILD_DIR/out/bin/convert-ly -e -d "$@"