Unexpected signal when buliding hugs98 CVS HEAD

The current CVS HEAD fails to bulid--there is an unexpected signal
encountered when running runhugs. I attached the end of my build log below.
This failure occurs on both platforms I tried: Ubuntu 6.06 and Windows XP.

It seems the recent change to input.c is to blame:
* If any valid Haskell module (I tried A.hs containing [ main = putStrLn
"hello" ] ) is substituted  for hapax.hs on the command line, the unexpected
signal still occurs. The problem is not specific to Cabal or hapax.hs.
* If a module with a syntax or typechecking error is substituted for
hapax.hs, runhugs correctly reports the error and exits.
* If I check out the sources as of 2006-09-06 and then build Hugs, the build
succeeds.
* If I then "cvs update -A," which gives me the new input.c, and then "make"
the build succeeds
* If I "make clean" after running "cvs update -A," and before rebuilding,
the same unexpected signal error stops the build.

Regards,
Brian

....
Preprocessing Network/Hackage/CabalInstall/Install
Preprocessing Network/Hackage/CabalInstall/List
Preprocessing Network/Hackage/CabalInstall/Main
Preprocessing Network/Hackage/CabalInstall/Setup
Preprocessing Network/Hackage/CabalInstall/TarUtils
Preprocessing Network/Hackage/CabalInstall/Types
Preprocessing Network/Hackage/CabalInstall/Update
Preprocessing Network/Hackage/Client
Preprocessing Network/Hackage/Interface
Preprocessing Network/Hackage/Version
echo timestamp for bootlib >bootlib/.stamp
cd ../cpphs; HUGSFLAGS=-P../libraries/bootlib HUGSDIR=../hugsdir
../src/runhugs -98 ../packages/Cabal/examples/hapax.hs configure --verbose
--hugs --prefix='/us r/local' --scratchdir='../hugsdir/packages/cpphs'
--with-compiler=../src/ffihugs

Unexpected signal
make[1]: *** [../hugsdir/programs/cpphs/Main.hs] Error 1
make[1]: Leaving directory `/home/brian/hugs98/libraries'
make: *** [all] Error 2

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