Bison and flex for an arm-cross-compiler

[root]

Hello, I wish someone can help me 

I m working on the following  PC computer: 
Linux  2.4.8-26mdk  i686 under Mandrake 8.

I have the gnu gcc et g++ (egcs-1.1.2) compilers 
gcc             2.96-0.62 mdk
gcc-c++      2.96....
gcc-cpp      2.96...
gcc3.0-cpp  3.0.1-1mdk

I've installed bison 1.28-9mdk  and flex 2.5.4a-16mdk
                

I have also installed an arm-cross compiler by unzipping a kind of the 
following file
arm_toolchain_binutils-2.11_gcc-2.95.3_glibc-2.2.3.tar.gz

Since I have to build programs with the arm-cross compiler that require bison 
and flex , i wonder 1 or 2 things:
1/Can I use the packages bison and flex I've installed  before having the 
cross compiler and how ?
2/Do I have to build Bison and flex with the arm-cross-compiler ? In this 
case where can I find the sources ? how to build them and where to put the 
result ? in which directory : /arm/lib/...

Thank you a lot of answering me 
bye 
Dan