Problems compiling source on Windows XP

Hi- I followed your directions (in FAQ_MSWIN and INSTALL) to install PostgreSQL with Cygwin on my Windows XP machine. I made sure
that the Cygwin path was first on my PATH variable. I even uninstalled MS Visual Studio completely. I keep getting an error (output
appended below) that GEN_fmgrtab.sh fails because ../../../src/include/catalog/pg_proc.h can't be found while trying to create
fmgroids.h. I ran ./configure again to see if that was what was wrong.
Please let me know what could be wrong, or if there is other info I need to send you for you to be able to diagnose the problem.
Thanks, Elissa

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make -C doc all
make[1]: Entering directory `/d/pgsql7.4/postgresql-7.4/doc'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/d/pgsql7.4/postgresql-7.4/doc'
make -C src all
make[1]: Entering directory `/d/pgsql7.4/postgresql-7.4/src'
make -C port all
make[2]: Entering directory `/d/pgsql7.4/postgresql-7.4/src/port'
make[2]: Nothing to be done for `all'.
make[2]: Leaving directory `/d/pgsql7.4/postgresql-7.4/src/port'
make -C backend all
make[2]: Entering directory `/d/pgsql7.4/postgresql-7.4/src/backend'
make -C ../../src/port all
make[3]: Entering directory `/d/pgsql7.4/postgresql-7.4/src/port'
make[3]: Nothing to be done for `all'.
make[3]: Leaving directory `/d/pgsql7.4/postgresql-7.4/src/port'
make -C utils fmgroids.h
make[3]: Entering directory `/d/pgsql7.4/postgresql-7.4/src/backend/utils'
CPP='gcc -E' AWK='gawk' /bin/sh.exe Gen_fmgrtab.sh ../../../src/include/catalog/pg_proc.h
Gen_fmgrtab.sh failed
make[3]: Leaving directory `/d/pgsql7.4/postgresql-7.4/src/backend/utils'
make[2]: Leaving directory `/d/pgsql7.4/postgresql-7.4/src/backend'
make[1]: Leaving directory `/d/pgsql7.4/postgresql-7.4/src'