Traditionally, the networking header files are completely separate from the
operating system header files. This is because AmiTCP shipped an SDK which
mimicked the layout of the SAS/C runtime library header files, and even
had special support libraries which made porting Unix code to AmiTCP easier.

If you copied the bunch on top of your existing header files, you actually
damaged your standard 'C' compiler installation, and it would no longer work
with AmiTCP either. Some of the files in the AmiTCP SDK replaced those in the
'C' compiler installation, and some of them actually required that the
original 'C' compiler installation would remain untouched.

Keep the "netinclude" directory separate. To access the header files, add
"-Inetinclude" (for GCC) or "idir=netinclude" (for SAS/C) to the compiler
command line.