bison-2.3 build error: src/bison not found

[Timothy Madden]

Hello

I am trying to build bison-2.3 on a CentOS 5.5 machine, and in some 
cases (not always and not on all branches of my project, which uses 
bison) I get this error from the make step:

...
Making all in src
make[2]: Entering directory 
`/home/adrian/ci/home/jobs/RB-8.3.1_bds-64bit/workspace/RB-8.3.1_bds-64bit/release_64/external/bison-2.3/src'
/bin/sh ../../../../external/bison-2.3/build-aux/ylwrap 
../../../../external/bison-2.3/src/scan-gram.l lex.yy.c scan-gram.c -- flex
../tests/bison -y  "-dv" ../../../../external/bison-2.3/src/parse-gram.y
../tests/bison: line 8: 
/home/adrian/ci/home/jobs/RB-8.3.1_bds-64bit/workspace/RB-8.3.1_bds-64bit/release_64/external/bison-2.3/tests/.././src/bison: 
No such file or directory
../tests/bison: line 8: exec: 
/home/adrian/ci/home/jobs/RB-8.3.1_bds-64bit/workspace/RB-8.3.1_bds-64bit/release_64/external/bison-2.3/tests/.././src/bison: 
cannot execute: No such file or directory
make[2]: *** [parse-gram.c] Error 126
make[2]: Leaving directory 
`/home/adrian/ci/home/jobs/RB-8.3.1_bds-64bit/workspace/RB-8.3.1_bds-64bit/release_64/external/bison-2.3/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory 
`/home/adrian/ci/home/jobs/RB-8.3.1_bds-64bit/workspace/RB-8.3.1_bds-64bit/release_64/external/bison-2.3'
make: *** [all] Error 2


It appears that building bison requires bison already build, which would 
be very strange to me if so. I do not really understand the automake 
rules in the .am files in bison-2.3 distribution.

Can anyone please help ? What am I doing wrong ?

Thank you,
Timothy Madden