Problem compiling from cvs, mingw

I get the following error:

 

gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Winline -fno-strict-aliasing -I. -I../../../src/include -I./src/include/port/win32 -DEXEC_BACKEND  "-I../../../src/include/port/win32" -DBUILDING_DLL  -c -o bootparse.o bootparse.c
bootparse.y:101:10: "b4_file_name" is not a valid filename
make[3]: *** [bootparse.o] Error 1
make[3]: Leaving directory `/pgsql/src/backend/bootstrap'
make[2]: *** [bootstrap-recursive] Error 2
make[2]: Leaving directory `/pgsql/src/backend'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/pgsql/src'
make: *** [all] Error 2

I have installed flex 2.5.4 y bison 2.1.

 

The configure scripts pass correctly the tests for flex and bison.

 

The problem seems to como from src/backend/bootstrap/bootparse.c with I suposse works with bison, but I do not know how.

 

Thanks for any help.