building rpm for 64 bit m/c

I complied libraries and binaries compiled with 64bit support.
I can run the binary successfully.

Then I created rpm using following command 
rpmbuild -bb SPECS/epm.spec

But when I try to install it, it gives me following error message

error: Failed dependencies:
libaio.so.1()(64bit) is needed by epm_common-1.4.15-1.x86_64
libaio.so.1(LIBAIO_0.1)(64bit) is needed by epm_common-1.4.15-1.x86_64
libaio.so.1(LIBAIO_0.4)(64bit) is needed by epm_common-1.4.15-1.x86_64

I have removed 'Requires' sections which checks the dependencies, still
I get error while installing rpm.

I can successfully install the rpm with --nodeps option.

But I want clean solution rather that work around.

Anybody please help me into it.
Are there any special command line options to build rpm for 64 machines?



-thanks,
Suresh