For sake of having nice interop with C we need to have access to all the same base libraries. The full list of header files is given below:

• assert.h (not useable without C-style macros.)
• complex.h
• ctype.h
• errno.h
• fenv.h
• float.h
• inttypes.h
• iso646.h
• limits.h
• locale.h
• math.h
• setjmp.h
• signal.h
• stdalign.h
• stdarg.h
• stdatomic.h
• stdbool.h
• stddef.h
• stdint.h
• stdio.h
• stdlib.h
• stdnoreturn.h
• string.h
• tgmath.h
• threads.h
• time.h
• uchar.h
• wchar.h
• wctype.h

Each header would map to a single extern object in scala.scalanative.libc package. Some of the headers might not map directly or need some additional compiler magic, we need to discover those cases sooner rather than later.