Compiling make error: incompatible with i386:x86-64 output

[marcosxp1]

Hello, I would appreciate your help as I'm unable to compile due to this error:

/usr/bin/ld: i386 architecture of input file `allocator.o' is incompatible with i386:x86-64 output
/usr/bin/ld: i386 architecture of input file `exception.o' is incompatible with i386:x86-64 output
collect2: ld returned 1 exit status
make[1]: *** [theforgottenserver] Error 1
make[1]: Leaving directory `/home/sources'
make: *** [all] Error 2

my system: Ubuntu 10.04.4 LTS 64 Bits


Sorry for the English, I'm Brazilian,and using bing translator.

Thanks.

 

[marcosxp1]

I saw on another forum that a person solved this problem as follows:
i've fixed it my adding -m64 to the optional flags and it worked – Tarek Adel Feb 4 '13 at 11:28
but here comes the doubt, in what file add this?
http://stackoverflow.com/questions/...64-bit-debian-6-make#comment20532795_14685573

 

[marcosxp1]

should I add the command in the sources, because mine are 32-bits,
I want to make the 64-bits sources.