make install fails on OSX

[dwrensha]

$ sudo make install
cfg: build triple x86_64-apple-darwin
cfg: host triples x86_64-apple-darwin
cfg: target triples x86_64-apple-darwin
cfg: enabling more debugging (CFG_ENABLE_DEBUG)
cfg: host for x86_64-apple-darwin is x86_64
cfg: os for x86_64-apple-darwin is apple-darwin
cfg: using clang
cfg: no pandoc found, omitting PDF and EPUB docs
cfg: no llnextgen found, omitting grammar-verification
cfg: including prepare rules
cfg: including dist rules
cfg: including install rules
cleaning destination tmp/dist/rust-0.11-pre-x86_64-apple-darwin
prepare: tmp/dist/rust-0.11-pre-x86_64-apple-darwin/bin
prepare: tmp/dist/rust-0.11-pre-x86_64-apple-darwin/lib
prepare: tmp/dist/rust-0.11-pre-x86_64-apple-darwin/share/man/man1
prepare: tmp/dist/rust-0.11-pre-x86_64-apple-darwin/lib/libcore-*.dylib
ls: x86_64-apple-darwin/stage2/lib/libcore-*.dylib: No such file or directory
usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 file2
       install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 ... fileN directory
       install -d [-v] [-g group] [-m mode] [-o owner] directory ...
make: *** [prepare-host-lib-core-2-x86_64-apple-darwin-dir-x86_64-apple-darwin] Error 64

I observe this behavior at ab22d99.
Using a fresh git checkout does not help.

[thestinger]

It's also broken on Linux:

prepare: tmp/dist/rust-0.11-pre-i686-unknown-linux-gnu/lib/rustlib/i686-unknown-linux-gnu/lib/libgraphviz-*.rlib
prepare: tmp/dist/rust-0.11-pre-i686-unknown-linux-gnu/lib/rustlib/i686-unknown-linux-gnu/lib/libcore-*.so
ls: cannot access i686-unknown-linux-gnu/stage2/lib/rustlib/i686-unknown-linux-gnu/lib/libcore-*.so: No such file or directory
install: missing destination file operand after 'tmp/dist/rust-0.11-pre-i686-unknown-linux-gnu/lib/rustlib/i686-unknown-linux-gnu/lib/'
Try 'install --help' for more information.
/build/rust-git/src/rust/mk/dist.mk:245: recipe for target 'prepare-target-i686-unknown-linux-gnu-host-i686-unknown-linux-gnu-2-dir-i686-unknown-linux-gnu' failed
make: *** [prepare-target-i686-unknown-linux-gnu-host-i686-unknown-linux-gnu-2-dir-i686-unknown-linux-gnu] Error 1

[pnkfelix]

part of #8058