Base doesn't build in latest release

[yminsky]

This is on a fully up-to-date OS X machine.

#=== ERROR while installing base.v0.9.114.40+66 ===============================#
# opam-version 1.2.2
# os           darwin
# command      jbuilder build --only-packages base --root . -j 6 @install
# path         /Users/yminsky/.opam/4.04.0/build/base.v0.9.114.40+66
# compiler     4.04.0
# exit-code    1
# env-file     /Users/yminsky/.opam/4.04.0/build/base.v0.9.114.40+66/base-17978-9a098e.env
# stdout-file  /Users/yminsky/.opam/4.04.0/build/base.v0.9.114.40+66/base-17978-9a098e.out
# stderr-file  /Users/yminsky/.opam/4.04.0/build/base.v0.9.114.40+66/base-17978-9a098e.err
### stderr ###
# [...]
#     ocamlopt compiler-stdlib/gen/gen.{cmx,o}
#   ocamlmklib src/dllbase_stubs.so,src/libbase_stubs.a
#        ocaml src/int63_backend.ml (exit 2)
# (cd _build/default/src && /Users/yminsky/.opam/4.04.0/bin/ocaml select-int63-backend/select.ml -portable-int63 ${PORTABLE_INT63} -arch-sixtyfour true -o int63_backend.ml)
# Exception: Failure "bad command line arguments".
# Raised at file "pervasives.ml", line 32, characters 22-33
# Called from file "./select-int63-backend/select.ml", line 9, characters 6-43
# Called from file "toplevel/toploop.ml", line 180, characters 17-56
#
# Waiting for 1 job to finish.

[ghost]

This should be fixed