Here's a list of all of the include files from the source directory after untarring:
1055 nsadmin@localhost:/usr/local/aolserver >find . | egrep '.h$'
./aolserver3_0/include/ns.h
./aolserver3_0/include/nsextmsg.h
./aolserver3_0/include/nspd.h
./aolserver3_0/include/nsthread.h
./aolserver3_0/include/tcl.h
./aolserver3_0/include/tcl76.h
./aolserver3_0/include/tcl82.h
./aolserver3_0/include/tcl83.h
./aolserver3_0/include/tclDecls.h
./aolserver3_0/nsd/getopt.h
./aolserver3_0/nsd/nsd.h
./aolserver3_0/nsext/nsextmsg.h
./aolserver3_0/nspd/pd.h
./aolserver3_0/nsssl2/ssl.h
./aolserver3_0/nsssl2/ssltcl.h
./aolserver3_0/nsssl2/x509.h
./aolserver3_0/nssybpd/exutils.h
./aolserver3_0/nssybpd/nssyb.h
./aolserver3_0/tcl7.6/compat/dirent.h
./aolserver3_0/tcl7.6/compat/dirent2.h
./aolserver3_0/tcl7.6/compat/dlfcn.h
./aolserver3_0/tcl7.6/compat/float.h
./aolserver3_0/tcl7.6/compat/limits.h
./aolserver3_0/tcl7.6/compat/stdlib.h
./aolserver3_0/tcl7.6/compat/string.h
./aolserver3_0/tcl7.6/compat/tclErrno.h
./aolserver3_0/tcl7.6/compat/unistd.h
./aolserver3_0/tcl7.6/generic/tcl.h
./aolserver3_0/tcl7.6/generic/tclInt.h
./aolserver3_0/tcl7.6/generic/tclPatch.h
./aolserver3_0/tcl7.6/generic/tclPort.h
./aolserver3_0/tcl7.6/generic/tclRegexp.h
./aolserver3_0/tcl7.6/unix/tclUnixPort.h
./aolserver3_0/tcl8.3.0/compat/dirent.h
./aolserver3_0/tcl8.3.0/compat/dirent2.h
./aolserver3_0/tcl8.3.0/compat/dlfcn.h
./aolserver3_0/tcl8.3.0/compat/float.h
./aolserver3_0/tcl8.3.0/compat/limits.h
./aolserver3_0/tcl8.3.0/compat/stdlib.h
./aolserver3_0/tcl8.3.0/compat/string.h
./aolserver3_0/tcl8.3.0/compat/tclErrno.h
./aolserver3_0/tcl8.3.0/compat/unistd.h
./aolserver3_0/tcl8.3.0/generic/regcustom.h
./aolserver3_0/tcl8.3.0/generic/regerrs.h
./aolserver3_0/tcl8.3.0/generic/regex.h
./aolserver3_0/tcl8.3.0/generic/regguts.h
./aolserver3_0/tcl8.3.0/generic/tcl.h
./aolserver3_0/tcl8.3.0/generic/tclCompile.h
./aolserver3_0/tcl8.3.0/generic/tclDecls.h
./aolserver3_0/tcl8.3.0/generic/tclInitScript.h
./aolserver3_0/tcl8.3.0/generic/tclInt.h
./aolserver3_0/tcl8.3.0/generic/tclIntDecls.h
./aolserver3_0/tcl8.3.0/generic/tclIntPlatDecls.h
./aolserver3_0/tcl8.3.0/generic/tclMath.h
./aolserver3_0/tcl8.3.0/generic/tclPlatDecls.h
./aolserver3_0/tcl8.3.0/generic/tclPort.h
./aolserver3_0/tcl8.3.0/generic/tclRegexp.h
./aolserver3_0/tcl8.3.0/unix/tclUnixPort.h
./aolserver3_0/tcl8.3.0/unix/tclUnixThrd.h
./aolserver3_0/tcl8.3.0/win/tclWinInt.h
./aolserver3_0/tcl8.3.0/win/tclWinPort.h
./aolserver3_0/tcl8.3.0/win/tclWinThrd.h
./aolserver3_0/thread/thread.h
