flex -P barfs

[Andrew Suffield]

automake utterly fails to comprehend the -P option to flex:

flex  -Pfoo `test -f foo.l || echo './'`foo.l
sed '/^#/ s|lex.yy\.c|foo-foo.c|' lex.yy.c >foo-foo.c
sed: can't read lex.yy.c: No such file or directory
make: *** [foo-foo.c] Error 2

-Pfoo gives you lex.foo.c, not lex.yy.c, so that won't work at
all. Manually stuffing a -olex.yy.c in there works. That's probably a
job for ylwrap.

-- 
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