Replacing Arm Compiler Standard C Library with Functional Safety C Library

I am currently using Arm Compiler for Embedded FuSa 6.16.2, and my project has been built successfully with the Arm Compiler standard C library.
I am now trying to replace only the standard C library with the Functional Safety (FuSa) C Library.

Below is my current environment and configuration:

• Product before replacement: DS000B DEVELOPMENT STUDIO GOLD FL ARCHIV
• Product after replacement: Development Studio UBL Gold FUSA (DEVST-GLDF)
• Target device: TI AM2431 (Cortex‑R5)
• Floating point: hardfp
• Endian: little-endian
• Build system: Makefile
• Position independence: not configured (unclear)

I first downloaded and installed ArmCLib6.6.BArmv7A+R from the download page.

Then, based on the Libraries and Compiler User Guides, I applied the following settings:

• Linker options:
  • -nobuiltininc
  • -nostdlib
  • -nostdlibinc
• LIBPATH:
  • C:/Program Files/ArmCLib6.6.BArmv7A+R/lib
• Added libraries:
  • fusa_clib_armv7a_hardfp_ropi.b
  • fusa_clib_armv7a_hardfp_ropi.l
• INCLUDE_PATH:
  • C:/Program Files/ArmCLib6.6.BArmv7A+R/include

I selected the following FuSa libraries:

• fusa_clib_armv7a_hardfp_ropi.b
• fusa_clib_armv7a_hardfp_ropi.l

Is this choice correct for Cortex‑R5 + hardfp + little-endian?
I could not find a clear selection guide in the documentation.
If a library selection guide exists, could you please point me to it?

With the above configuration, my build fails because SEEK_SET, which is normally defined in stdio.h, becomes undefined.

Does this mean that the FuSa C Library does not provide some macros or functions found in the standard C library?

Any guidance or documentation would be greatly appreciated.