* Merge remaining stuff from the nix-make branch.

* Add support for the creation of shared libraries to `compileC',
  `link', and `makeLibrary'.
* Enable the ATerm library to be made into a shared library.

make/lib/default.nix

@@ -0,0 +1,59 @@
+rec {
+
+  # Should point at your Nixpkgs installation.
+  pkgPath = ./pkgs;
+
+  pkgs = import (pkgPath + /system/all-packages.nix) {};
+
+  stdenv = pkgs.stdenv;
+  
+
+  compileC = {main, localIncludes ? [], cFlags ? "", forSharedLib ? false}:
+  stdenv.mkDerivation {
+    name = "compile-c";
+    builder = ./compile-c.sh;
+    localIncludes =
+      if localIncludes == "auto" then
+        import (findIncludes {
+          main = toString main;
+          hack = __currentTime;
+          inherit cFlags;
+        })
+      else
+        localIncludes;
+    inherit main;
+    cFlags = [
+      cFlags
+      (if forSharedLib then ["-fpic"] else [])
+    ];
+  };
+
+  /*
+  runCommand = {command}: {
+    name = "run-command";
+    builder = ./run-command.sh;
+    inherit command;
+  };
+  */
+
+  findIncludes = {main, hack, cFlags ? ""}: stdenv.mkDerivation {
+    name = "find-includes";
+    builder = ./find-includes.sh;
+    inherit main hack cFlags;
+  };
+  
+  link = {objects, programName ? "program", libraries ? []}: stdenv.mkDerivation {
+    name = "link";
+    builder = ./link.sh;
+    inherit objects programName libraries;
+  };
+
+  makeLibrary = {objects, libraryName ? [], sharedLib ? false}:
+  # assert sharedLib -> fold (obj: x: assert obj.sharedLib && x) false objects
+  stdenv.mkDerivation {
+    name = "library";
+    builder = ./make-library.sh;
+    inherit objects libraryName sharedLib;
+  };
+
+}