Guile 1.6 unbuildable if psyntax.ss touched (bitrot?)

[Rob Browning]

Running autogen.sh on the debian package's source tree somehow causes
automake to think that pssyntax.pp is out of date.  However, when make
goes to rebuild pssyntax.pp, the attempt fails.  Does this ring any
bells for anyone?

  make[2]: Entering directory `/home/rlb/src/guile/1.6/ice-9'
  /home/rlb/src/guile/1.6/pre-inst-guile -s ./compile-psyntax.scm \
          ./psyntax.ss ./psyntax.pp
  /home/rlb/src/guile/1.6/ice-9/syncase.scm:130:16: In procedure scm-error in 
expression (scm-error (quote misc-error) who ...):
  /home/rlb/src/guile/1.6/ice-9/syncase.scm:130:16: invalid syntax ()
  make[2]: *** [psyntax.pp] Error 2
  make[2]: Leaving directory `/home/rlb/src/guile/1.6/ice-9'
  make[1]: *** [all-recursive] Error 1
  make[1]: Leaving directory `/home/rlb/src/guile/1.6'
  make: *** [all] Error 2

To reproduce, just rm ice-9/psyntax.pp and "make" in a 1.6 tree
configured with --enable-maintainer-mode.

-- 
Rob Browning
rlb @defaultvalue.org and @debian.org; previously @cs.utexas.edu
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