Force Couchdb to find Spidermonkey and Erlang

If you install Homebrew somewhere that isn't /usr/local couchdb doesn't find its deps, so patch that.

See? Install to /usr/local!

Fixes Homebrew/homebrew#180. Closes Homebrew/homebrew#493.

Formula/couchdb.rb

@@ -9,18 +9,54 @@ class Couchdb <Formula
   depends_on 'icu4c'
   depends_on 'erlang'
 
+  def patches; DATA end
+
   def install
     system "./configure", "--prefix=#{prefix}",
                           "--localstatedir=#{var}",
-                          "--sysconfdir=#{etc}",
-                          "--with-erlang=#{HOMEBREW_PREFIX}/lib/erlang/usr/include"
+                          "--sysconfdir=#{etc}"
     system "make"
     system "make install"
 
-    couchjs = "#{prefix}/lib/couchdb/bin/couchjs"
-    system "chmod 755 #{couchjs}"
-
+    (prefix+"lib/couchdb/bin/couchjs").chmod 0755
     (var+'lib'+'couchdb').mkpath
     (var+'log'+'couchdb').mkpath
   end
 end
+
+
+# this patch because couchdb doesn't try to find where spidermonkey or erlang
+# are installed it just adds a bunch of paths and hopes for the best. However
+# for users who install Homebrew somewhere that is non standard, this breaks
+__END__
+diff --git a/configure b/configure
+index edb6438..472cd2c 100755
+--- a/configure
++++ b/configure
+@@ -11240,10 +11240,7 @@ if test "${with_erlang+set}" = set; then :
+ 
+ else
+ 
+-    ERLANG_FLAGS="-I${libdir}/erlang/usr/include"
+-    ERLANG_FLAGS="$ERLANG_FLAGS -I/usr/lib/erlang/usr/include"
+-    ERLANG_FLAGS="$ERLANG_FLAGS -I/usr/local/lib/erlang/usr/include"
+-    ERLANG_FLAGS="$ERLANG_FLAGS -I/opt/local/lib/erlang/usr/include"
++    ERLANG_FLAGS="-I$(dirname $(dirname $(which erl)))/lib/erlang/usr/include"
+ 
+ fi
+ 
+@@ -11257,13 +11257,7 @@ if test "${with_js_include+set}" = set; then :
+ 
+ else
+ 
+-    JS_FLAGS="-I/usr/include"
+-    JS_FLAGS="$JS_FLAGS -I/usr/include/js"
+-    JS_FLAGS="$JS_FLAGS -I/usr/include/mozjs"
+-    JS_FLAGS="$JS_FLAGS -I/usr/local/include"
+-    JS_FLAGS="$JS_FLAGS -I/opt/local/include"
+-    JS_FLAGS="$JS_FLAGS -I/usr/local/include/js"
+-    JS_FLAGS="$JS_FLAGS -I/opt/local/include/js"
++    JS_FLAGS="-I`js-config --includedir`/js"
+ 
+ fi
+