build failure on cygwin

[Eli Handel]

Same for me:

$ uname -a
CYGWIN_NT-5.0 xxxxx 1.5.25(0.156/4/2) 2008-06-12 19:34 i686 Cygwin

$ ./configure --enable-fat --disable-static --enable-shared
runs ok

but:
$ make
./gen-fac_ui  0 >mpz/fac_ui.h || (rm -f mpz/fac_ui.h; exit 1)
Usage: gen-fac_ui limbbits nailbits
make: *** [mpz/fac_ui.h] Error 1
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