make binary-dist broken on OS X in HEAD

After a successful configure and make, make binary-dist fails:

➜  ghc git:(master) make            
===--- building phase 0
make -r --no-print-directory -f ghc.mk phase=0 phase_0_builds
make[1]: Nothing to be done for `phase_0_builds'.
===--- building phase 1
make -r --no-print-directory -f ghc.mk phase=1 phase_1_builds
make[1]: Nothing to be done for `phase_1_builds'.
===--- building final phase
make -r --no-print-directory -f ghc.mk phase=final all
make[1]: Nothing to be done for `all'.
➜  ghc git:(master) make binary-dist
rm -f bindist-list
make -r --no-print-directory -f ghc.mk bindist BINDIST=YES
"cp" -p ghc/stage1/build/tmp/ inplace/lib/bin/ghc-stage1
cp: ghc/stage1/build/tmp/ is a directory (not copied).
make[1]: *** [inplace/lib/bin/ghc-stage1] Error 1
make: *** [binary-dist-prep] Error 2

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
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