maxima: patch imaxima.el

Patch fixes imaxima.el temp directory on OS X

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/maxima.rb

@@ -10,6 +10,12 @@ class Maxima < Formula
   depends_on 'gnuplot'
   depends_on 'rlwrap'
 
+  def patches
+    # fixes 3468021: imaxima.el uses incorrect tmp directory on OS X:
+    # https://sourceforge.net/tracker/?func=detail&aid=3468021&group_id=4933&atid=104933
+    DATA
+  end
+
   def install
     ENV.deparallelize
     system "./configure", "--disable-debug", "--disable-dependency-tracking",
@@ -25,3 +31,18 @@ class Maxima < Formula
     system "maxima --batch-string='run_testsuite(); quit();'"
   end
 end
+
+__END__
+diff --git a/interfaces/emacs/imaxima/imaxima.el b/interfaces/emacs/imaxima/imaxima.el
+index e3feaa6..3a52a0b 100644
+--- a/interfaces/emacs/imaxima/imaxima.el
++++ b/interfaces/emacs/imaxima/imaxima.el
+@@ -296,6 +296,8 @@ nil means no scaling at all, t allows any scaling."
+ 	 (temp-directory))
+ 	((eql system-type 'cygwin)
+ 	 "/tmp/")
++	((eql system-type 'darwin)
++	 "/tmp/")
+ 	(t temporary-file-directory))
+   "*Directory used for temporary TeX and image files."
+   :type '(directory)