Background: Erlang Release 17 uses UTF-8 encoding of source files by default. Certain bit-sequences are not valid in UTF-8.
Some files are not UTF-8 encoded in lhttpc. lhttpc.app.src has the name Oscar Hellström encoded in ISO-8851-1 for instance.
Suggestion: Use the UNIX file tool no all files and make sure they are UTF-8 encoded.