Don't do anything with mw-explore during buildall - it contains unreliable junk.

buildall.sh

@@ -140,6 +140,8 @@ fi
 
 for dir in mw-*
 do
+  if [ "${dir}" != "mw-explore" ]
+  then
     pushd ${dir}
 
     # Make a temporary directory to keep the work-in-progress files.
@@ -272,6 +274,7 @@ do
     # if nothing broke so far, clean up...
     rm -rf "${tmp}"
     popd
+  fi
 done