[...]
ld: error: /home/users/builder/rpm/BUILD/VirtualBox-4.0.10_OSE/out/linux.x86/release/obj/pcnet32.rom.rt: unsupported ELF file type 2
ld: error: /home/users/builder/rpm/BUILD/VirtualBox-4.0.10_OSE/out/linux.x86/release/obj/pcnet32.rom.rt1.uo: unsupported ELF file type 2
ld: error: /home/users/builder/rpm/BUILD/VirtualBox-4.0.10_OSE/out/linux.x86/release/obj/pcnet32.rom.rt2.zo: unsupported ELF file type 2
ld: error: undefined symbol '_text' referenced in expression
ld: error: undefined symbol '_stack_offset' referenced in expression
ld: error: undefined symbol '_text' referenced in expression
ld: error: undefined symbol '_ebss' referenced in expression
ld: error: undefined symbol '_real_to_prot' referenced in expression
ld: error: undefined symbol '_prot_to_real' referenced in expression
ld: error: undefined symbol '_rm_in_call' referenced in expression
ld: error: undefined symbol '_in_call' referenced in expression
ld: error: undefined symbol 'rom' referenced in expression
ld: error: undefined symbol 'rm_etherboot_location' referenced in expression
ld: error: undefined symbol '_stack_end' referenced in expression
ld: error: undefined symbol '_text' referenced in expression
ld: error: undefined symbol '_stack_offset' referenced in expression
ld: error: undefined symbol '_text' referenced in expression
ld: error: undefined symbol '_ebss' referenced in expression
ld: error: Cannot decompress in place
ld: error: undefined symbol '_real_to_prot' referenced in expression
ld: error: undefined symbol '_prot_to_real' referenced in expression
ld: error: undefined symbol '_rm_in_call' referenced in expression
ld: error: undefined symbol '_in_call' referenced in expression
ld: error: undefined symbol 'rom' referenced in expression
ld: error: undefined symbol 'rm_etherboot_location' referenced in expression
ld: error: undefined symbol '_stack_end' referenced in expression
[...]