Some "obvious" switching from racket' to racket/base'.

collects/eopl/eopl.rkt

@@ -1,10 +1,12 @@
-#lang racket
+#lang racket/base
 
 (require "datatype.rkt"
          "private/sllgen.rkt"
+         racket/promise
          mzlib/trace
          mzlib/pretty)
-(require (for-syntax "private/slldef.rkt"))
+(require (for-syntax racket/base
+                     "private/slldef.rkt"))
 
 (provide define-datatype
          cases)

collects/htdp/convert.rkt

@@ -1,4 +1,4 @@
-#lang racket
+#lang racket/base
 
 (require racket/gui)
 

collects/schemeunit/gui.rkt

@@ -1,3 +1,3 @@
-#lang racket
+#lang racket/base
 (require rackunit/gui)
 (provide (all-from-out rackunit/gui))

collects/schemeunit/main.rkt

@@ -1,3 +1,3 @@
-#lang racket
+#lang racket/base
 (require rackunit)
 (provide (all-from-out rackunit))

collects/schemeunit/text-ui.rkt

@@ -1,3 +1,3 @@
-#lang racket
+#lang racket/base
 (require rackunit/text-ui)
 (provide (all-from-out rackunit/text-ui))

collects/typed/rackunit.rkt

@@ -1,3 +1,3 @@
-#lang racket
+#lang racket/base
 (require typed/rackunit/main)
 (provide (all-from-out typed/rackunit/main))

src/mac/install-libs.rkt

@@ -1,5 +1,5 @@
-#lang racket
-(require racket/system)
+#lang racket/base
+(require racket/path racket/system)
 
 (define from (vector-ref (current-command-line-arguments) 0))
 (define to