* Deal with directory components in header file references (e.g.,

`#include "foo/../bar/bla.h"') by building an appropriate tree of
  symlinks.

examples/not-so-simple-header/default.nix

@@ -0,0 +1,14 @@
+let {
+
+  inherit (import ../../lib) compileC link;
+
+  hello = link {objects = compileC {
+    main = ./foo/hello.c;
+    localIncludes = [
+      [./foo/fnord/indirect.h "fnord/indirect.h"]
+      [./bar/hello.h "fnord/../../bar/hello.h"]
+    ];
+  };};
+
+  body = [hello];
+}