--debug-configure doesn't quite work

[David Holmes]

I used --debug-configure to try and debug configure but the resulting 
debug log just stops abruptly:

++ WC=/usr/bin/wc
++ test -n /usr/bin/wc
++ printf '%s\n' 'configure:5726: result: /usr/bin/wc'
++ printf '%s\n' /usr/bin/wc
++ test -n /usr/bin/wc
++ break
++ test x/usr/bin/wc = x
++ for ac_prog in which
++ set dummy which
++ ac_word=which
++ printf '%s\n' 'configure:5755: checking for which'
++ printf %s 'checking for which... '
++ false
++ case $WHICH in
++ as_save_IFS='
'
++ IFS=

???

David