Compilation problem in CVS head

I'm trying to compile rekall CVS head (KDE version) and encounter this:

bison -pel_yy -o el.tab.cpp el.y
el.y: conflicts: 35 shift/reduce
if /bin/sh ../../libtool --silent --mode=compile --tag=CXX g++ 
-DHAVE_CONFIG_H -I. -I. -I../.. -I/opt/kde3/include 
-I/usr/lib/qt3/include -I/usr/X11R6/include   -DQT_THREAD_SUPPORT  
-D_REENTRANT  -Wnon-virtual-dtor -Wno-long-long -Wundef -Wall -pedantic 
-W -Wpointer-arith -Wmissing-prototypes -Wwrite-strings -ansi 
-D_XOPEN_SOURCE=500 -D_BSD_SOURCE -Wcast-align -Wconversion -O2 
-fno-exceptions -fno-check-new  -MT el.tab.lo -MD -MP -MF 
".deps/el.tab.Tpo" \
  -c -o el.tab.lo `test -f 'el.tab.cpp' || echo './'`el.tab.cpp; \
then mv ".deps/el.tab.Tpo" ".deps/el.tab.Plo"; \
else rm -f ".deps/el.tab.Tpo"; exit 1; \
fi
el.tab.cpp:285:6: warning: "YYSTACK_USE_ALLOCA" is not defined
el.tab.cpp:1109:5: warning: "YYMAXDEPTH" is not defined
el.tab.cpp: In function `int el_yyparse()':
el.tab.cpp:2132: error: parse error before `goto'
el.tab.cpp:2123: warning: label `yyerrlab1' defined but not used
In file included from el.y:408:
lex.el_yy.c:508:5: warning: "YY_STACK_USED" is not defined
lex.el_yy.c:1602:5: warning: "YY_ALWAYS_INTERACTIVE" is not defined
lex.el_yy.c:1896:5: warning: "YY_MAIN" is not defined
make[3]: *** [el.tab.lo] Fehler 1
make[3]: Leaving directory `/home/peter/devel/rekall/rekall/libs/el32'
make[2]: *** [all-recursive] Fehler 1
make[2]: Leaving directory `/home/peter/devel/rekall/rekall/libs'
make[1]: *** [all-recursive] Fehler 1
make[1]: Leaving directory `/home/peter/devel/rekall/rekall'
make: *** [all] Fehler 2


bison (GNU Bison) 1.875
flex version 2.5.4

Perhaps I need a different version of those?