Parallel build broken

Here is what I did:

$ tar xf ghc-7.1.20100929-src.tar.bz2
$ cd ghc-7.1.20100929
$ perl boot
[...]
Booting libraries/unix/
Can't chmod 0755 darcs-all: No such file or directory at boot line 60.
$ ./configure --prefix=/opt/ghc
[...]
$ nohup make -j10

nohup.out is attached. The first error I spotted is:

/usr/bin/gcc -E    -fno-stack-protector  -Iincludes -lm           -MM utils/hp2ps/AreaBelow.c -MF utils/hp2ps/dist/build/.depend.c_asm.bit
[...]
In file included from includes/ghcconfig.h:5,
                 from utils/hp2ps/Main.h:4,
                 from utils/hp2ps/AreaBelow.c:1:

Apparently, includes/ghcplatform.h is read while it is being created.