[U-Boot] cross compiling fw_printenv on big endian

I seem to be having a problem with fw_printenv on my PowerPC 85xx target whereby I constantly get CRC32 errors:

# fw_printenv Warning: Bad CRC, using default environment

I tracked this down to the fact that u-boot/lib_generic/crc32.c is getting compiled with the __LITTLE_ENDIAN defined even though I have CROSS_COMPILE setup correctly [e.g. I can build u-boot.bin just fine].

Is there a special way to cross compile fw_printenv so that the __LITTLE_ENDIAN is not defined? Are there other PowerPC users that are building fw_printenv?

I'd rather do the "proper" thing than resort of hacking the crc32.c file.