Failure to make grap 1.30 under cygwin 1.5.5

[fergus@bonhard.uklinux.net]

A configure / make /make install that has been working successfully oob for
a long time recently failed. the relevant .tgz is unaltered, only Cygwin has
changed. Does the following output from make, throw any light on this? The
configure worked fine. I attach cygcheck.out.
Fergus

~/tmp/grap-1.30> make
grep "^#" grap.y > grap.cc ; grep "^#" grap_lex.l > grap_lex.cc; touch
y.tab.h
g++ -MM -Wall -DHAVE_CONFIG_H grap.cc grap_lex.cc *.cc >> .depend;
rm -f grap.cc grap_lex.cc y.tab.h
bison -y -d grap.y
mv y.tab.c grap.cc
g++ -Wall -DHAVE_CONFIG_H   -c -o grap.o grap.cc
flex -ograp_lex.cc grap_lex.l
g++ -Wall -DHAVE_CONFIG_H -Wno-unused -c grap_lex.cc
grap_lex.l: In function `void expand_macro(macro*)':
grap_lex.l:979: error: `yytext_ptr' undeclared (first use this function)
grap_lex.l:979: error: (Each undeclared identifier is reported only once for
each function it appears in.)
grap_lex.l: In function `bool is_macro(const std::string&)':
grap_lex.l:990: error: parse error before `--' token
grap_lex.l: At global scope:
grap_lex.l:996: error: parse error before `]' token
make: *** [grap_lex.o] Error 1
~/tmp/grap-1.30>
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