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3 questions about iptables

i use iptables....and i had the problem with the libraries :
iptables v1.2.3: Couldn't load target `MASQUERADE':/lib/iptables/libipt_MASQUERADE.so:
cannot open shared object file: No such file or directory

so i have edit the file roms_meta.txt in the /target/cris-axis-linux-gnu/libs...directory with :
Include: iptables
after then i make a make images and it works...
but when i make a : make install ... the roms_meta.txt file not contains the line Include: iptables - so i must edit another time this file
so my question:
exists a file in the packages directory where i can write the line : include: iptables permanently, that i dont must edit every time i make a make install the roms_meta.txt ????
2. question
if i look on the host pc in the directory : target/cris-axis-linux-gnu/libs/iptables... i can see that the size of the *.so files is very big - but when i mak a image for the board, oll of this file have room in the 2mb flash - - is this while the file were compressed very high???
3. question
i use iptables with the masquerade option:
i need all of the libraries in the target/cris-axis-linux-gnu/libs/iptables directory or only the lkibipt.masquerade.so?