AM_CPPFLAGS = -DUNIX -DKPATHSEA -DSUPPORT_8BIT -funsigned-char
AM_CFLAGS =
I made this change and ran autoreconf.
Vladimir, if that doesn't suffice to get the bibtex8 build working for
you, let me know. I'd rather not introduce new autoconf tests for
-funsigned-char if we don't have to.