Version of imagemagick that works with ruby 1.8.6

With newer version of imagemagick, rmagick locks up ruby process on
Ruby 1.8.6. ImageMagick-6.5.9-8 works for me.
I revived the formula and named it imagemagick-ruby186.

See:
 * http://stackoverflow.com/questions/2189129/rmagick-freezes-ruby-processes-when-required-on-os-x-snow-leopard
 * http://www.ruby-forum.com/topic/196606

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

versions/imagemagick-ruby186.rb

@@ -0,0 +1,80 @@
+# Ruby 1.8.6 requires a special version of imagemagick
+# We simply revived an earlier version and added the suffix.
+#   https://github.com/mxcl/homebrew/blob/685dbff9301c215ac6f7ca775bbe8eed2bf62662/Library/Formula/imagemagick.rb
+
+require 'formula'
+
+# some credit to http://github.com/maddox/magick-installer
+# NOTE please be aware that the GraphicsMagick formula derives this formula
+
+def ghostscript_srsly?
+  ARGV.include? '--with-ghostscript'
+end
+
+def x11?
+  # I used this file because old Xcode seems to lack it, and its that old
+  # Xcode that loads of people seem to have installed still
+  File.file? '/usr/X11/include/ft2build.h'
+end
+
+class ImagemagickRuby186 <Formula
+  url 'http://image_magick.veidrodis.com/image_magick/ImageMagick-6.5.9-8.tar.bz2'
+  md5 '89892e250e81fad51b4b2a1f816987e6'
+  homepage 'http://www.imagemagick.org'
+
+  depends_on 'jpeg'
+  depends_on 'libwmf' => :optional if x11?
+  depends_on 'libtiff' => :optional
+  depends_on 'little-cms' => :optional
+  depends_on 'jasper' => :optional
+  depends_on 'ghostscript' => :recommended if ghostscript_srsly? and x11?
+  depends_on 'libpng' unless x11?
+
+  def skip_clean? path
+    path.extname == '.la'
+  end
+
+  def fix_configure
+    # versioned stuff in main tree is pointless for us
+    inreplace 'configure', '${PACKAGE_NAME}-${PACKAGE_VERSION}', '${PACKAGE_NAME}'
+  end
+
+  def configure_args
+    args = ["--prefix=#{prefix}",
+     "--disable-dependency-tracking",
+     "--enable-shared",
+     "--disable-static",
+     "--with-modules",
+     "--without-magick-plus-plus"]
+
+     args << "--disable-openmp" if MACOS_VERSION < 10.6   # libgomp unavailable
+     args << '--without-ghostscript' \
+          << "--with-gs-font-dir=#{HOMEBREW_PREFIX}/share/ghostscript/fonts" \
+             unless ghostscript_srsly?
+     return args
+  end
+
+  def install
+    ENV.libpng
+    ENV.deparallelize
+    ENV.O3 # takes forever otherwise
+
+    fix_configure
+
+    system "./configure", "--without-maximum-compile-warnings",
+                          "--disable-osx-universal-binary",
+                          "--without-perl", # I couldn't make this compile
+                          *configure_args
+    system "make install"
+
+    # We already copy these into the keg root
+    (share+"ImageMagick/NEWS.txt").unlink
+    (share+"ImageMagick/LICENSE").unlink
+    (share+"ImageMagick/ChangeLog").unlink
+  end
+
+  def caveats
+    "You don't have X11 from the Xcode DMG installed. Consequently Imagemagick is less fully featured." unless x11?
+  end
+end
+