diff --git a/collects/ffi/unsafe/objc.rkt b/collects/ffi/unsafe/objc.rkt
index d299fbfd3f..3031bdbd7e 100644
--- a/collects/ffi/unsafe/objc.rkt
+++ b/collects/ffi/unsafe/objc.rkt
@@ -188,7 +188,8 @@
 (define-objc objc_addClass (_fun _objc_class-pointer -> _void)
   #:fail (lambda () #f))
 
-(define-objc object_getClass (_fun _id -> _Class))
+(define-objc object_getClass (_fun _id -> _Class)
+  #:fail (lambda () #f))
 
 (provide class_addMethod)
 (define (class_addMethod cls sel imp ty enc)
@@ -207,7 +208,11 @@
   #:fail (lambda () #f))
 
 (define-objc/private objc_msgSend _fpointer)
-(define-objc/private objc_msgSend_fpret _fpointer)
+(define-objc/private objc_msgSend_fpret _fpointer
+  #:fail (lambda ()
+           ;; If objc_msgSend_fpret is not available, assume that
+           ;; it's the same as objc_msgSend
+           objc_msgSend))
 (define-objc/private objc_msgSend_stret _fpointer)
 (define-objc/private objc_msgSendSuper _fpointer)
 (define objc_msgSendSuper_fpret objc_msgSendSuper) ; why no fpret variant?
@@ -631,6 +636,11 @@
       (class_addProtocol id proto)
       (add-protocol-the-hard-way id proto)))
 
+(define (object-get-class id)
+  (if object_getClass
+      (object_getClass id)
+      (ptr-ref id _Class)))
+
 (define (layout->string l)
   (case l
     [(uint8) "C"]
@@ -730,7 +740,7 @@
                                    [_ (error "oops")])
                                  '())]
                             [in-cls (if in-class?
-                                        #'(object_getClass cls)
+                                        #'(object-get-class cls)
                                         #'cls)]
                             [atomic? (or (free-identifier=? #'kind #'+a)
                                          (free-identifier=? #'kind #'-a))])
@@ -807,4 +817,4 @@
 (provide objc-is-a?)
 
 (define (objc-is-a? v c)
-  (ptr-equal? (object_getClass v) c))
+  (ptr-equal? (object-get-class v) c))
diff --git a/src/gracket/get-libs.rkt b/src/gracket/get-libs.rkt
index 79a58b21a0..02323b728c 100644
--- a/src/gracket/get-libs.rkt
+++ b/src/gracket/get-libs.rkt
@@ -56,7 +56,9 @@
           ["libpixman-1.0.dylib" 499440]
           ["libgthread-2.0.0.dylib" 21728]
           ["libpng14.14.dylib" 192224]
-          ["PSMTabBarControl.tgz" 107171])])]
+          ["PSMTabBarControl.tgz" 107171])]
+       [(ppc-macosx) 
+        '()])]
     [(windows)
      (let ([basic '(["libjpeg-7.dll" 233192]
                     ["libcairo-2.dll" 921369]
diff --git a/src/mac/install-libs.rkt b/src/mac/install-libs.rkt
index 3e7583b7db..a491f4c7d6 100644
--- a/src/mac/install-libs.rkt
+++ b/src/mac/install-libs.rkt
@@ -1,5 +1,5 @@
-#lang scheme
-(require scheme/system)
+#lang racket
+(require racket/system)
 
 (define from (vector-ref (current-command-line-arguments) 0))
 (define to (path->string (simplify-path (build-path (collection-path "scheme") 'up 'up "lib/") #f)))