(1) When using gnu-efi 4.0 with an application which was written for gnu-efi 3.0, it may be required to set the GNU_EFI_3_0_COMPAT compile flag this changes the default versions of some changed functions back to their prior versions This currently includes the following functions: * ReallocatePool * CopyMem * CompareGuid (2) Applications which haven't been updated in a while may also be missing the required '.rodata' section which contains needed read-only data which will prevent any binary missing this section from running correctly