diff --git a/Formula/mit-scheme.rb b/Formula/mit-scheme.rb
index c6a24cb6d0..3b02655d93 100644
--- a/Formula/mit-scheme.rb
+++ b/Formula/mit-scheme.rb
@@ -2,9 +2,9 @@ require 'formula'
 
 class MitScheme < Formula
   homepage 'http://www.gnu.org/software/mit-scheme/'
-  url 'http://ftpmirror.gnu.org/mit-scheme/stable.pkg/9.1.1/mit-scheme-c-9.1.1.tar.gz'
-  mirror 'http://ftp.gnu.org/gnu/mit-scheme/stable.pkg/9.1.1/mit-scheme-c-9.1.1.tar.gz'
-  sha1 '8f175a40061bdfc0248535e198cc7f5b5a0dce32'
+  url 'http://ftpmirror.gnu.org/mit-scheme/stable.pkg/9.2/mit-scheme-c-9.2.tar.gz'
+  mirror 'http://ftp.gnu.org/gnu/mit-scheme/stable.pkg/9.2/mit-scheme-c-9.2.tar.gz'
+  sha1 'd2820ee76da109d370535fec6e19910a673aa7ee'
 
   conflicts_with 'tinyscheme', :because => 'both install a `scheme` binary'
 
@@ -16,17 +16,12 @@ class MitScheme < Formula
     # change_make_var, because there are Makefiles littered everywhere
     ENV.j1
 
-    # Fix hard-coded locations of MACOSX_SYSROOT.
-    ['src/lib/include/configure', 'src/configure'].each do |configure|
-      inreplace configure, 'MACOSX_SYSROOT=/Developer/SDKs/${SDK}.sdk',
-                           "MACOSX_SYSROOT=/#{MacOS.sdk_path}"
-    end
 
     # Liarc builds must launch within the src dir, not using the top-level Makefile
     cd "src"
 
     # Take care of some hard-coded paths
-    inreplace %w(6001/edextra.scm 6001/floppy.scm compiler/etc/disload.scm configure
+    inreplace %w(6001/edextra.scm 6001/floppy.scm compiler/etc/disload.scm microcode/configure
     edwin/techinfo.scm edwin/unix.scm lib/include/configure lib/include/option.c
     swat/c/tk3.2-custom/Makefile swat/c/tk3.2-custom/tcl/Makefile swat/scheme/other/btest.scm) do |s|
       s.gsub! "/usr/local", prefix