`pthread` is missing on OS X

Learning
,
3

Thank you @cvine for experimenting! What you’ve proposed works fine for me. I just put a snippet for history.

LIB=`ocamlc -where`

libtool -static -o libexport.a \
	${LIB}/libasmrun.a \
	${LIB}/libunix.a \
	${LIB}/libthreadsnat.a \
	${LIB}/../lwt/unix/liblwt_unix_stubs.a \
	lib.o