## Importing packages

import(P) The library and visible sources of package `P` are available to satisfy `IMPORT` requests in the current compilation. The imported sources are not recompiled.

import_version(P, BuildDir) Like `import(P)`, but the library and visible sources of package `P` are selected from building directory `BuildDir` rather than the default building directory for the current platform.

include_dir(D) Recursively include the sources named in the `m3makefile` in subdirectory `D` of the current directory.

include_pkg(P) Include the sources named in package `P`'s `src/m3makefile`. The location of P may be overridden.

`Import` reflects the fact that programs are built from separately compiled pieces, rather than being compiled as a whole. If we always compiled from source, `include` would suffice.

    Last modified on Thu Jan  4 11:07:54 PST 1996 by heydon
         modified on Thu Apr 21 16:47:18 PDT 1994 by kalsow
         modified on Thu Jan  7 18:40:57 PST 1993 by muller