Implement basic ‘make install’

src/libexpr/primops.cc

@@ -1322,6 +1322,7 @@ void EvalState::createBaseEnv()
     /* Add a wrapper around the derivation primop that computes the
        `drvPath' and `outPath' attributes lazily. */
     string path = findFile("nix/derivation.nix");
+    assert(!path.empty());
     sDerivationNix = symbols.create(path);
     evalFile(path, v);
     addConstant("derivation", v);