diff --git a/pkgs/development/interpreters/ruby/ruby-1.8.7.nix b/pkgs/development/interpreters/ruby/ruby-1.8.7.nix
new file mode 100644
index 000000000000..9b43368c6173
--- /dev/null
+++ b/pkgs/development/interpreters/ruby/ruby-1.8.7.nix
@@ -0,0 +1,94 @@
+{ stdenv, fetchurl, fetchFromGitHub
+, zlib, zlibSupport ? true
+, openssl, opensslSupport ? true
+, gdbm, gdbmSupport ? true
+, ncurses, readline, cursesSupport ? false
+, groff, docSupport ? false
+, ruby_1_8_7, autoreconfHook, bison, useRailsExpress ? true
+}:
+
+let
+  op = stdenv.lib.optional;
+  ops = stdenv.lib.optionals;
+  patchSet = import ./rvm-patchsets.nix { inherit fetchFromGitHub; };
+  baseruby = ruby_1_8_7.override { useRailsExpress = false; };
+in
+
+stdenv.mkDerivation rec {
+  version = with passthru; "${majorVersion}.${minorVersion}.${teenyVersion}-p${patchLevel}";
+
+  name = "ruby-${version}";
+
+  src = if useRailsExpress then fetchFromGitHub {
+    owner  = "ruby";
+    repo   = "ruby";
+    rev    = "v1_8_7_${passthru.patchLevel}";
+    sha256 = "1xddhxr0j26hpxfixvhqdscwk2ri846w2129fcfwfjzvy19igswx";
+  } else fetchurl {
+    url = "http://cache.ruby-lang.org/pub/ruby/1.8/${name}.tar.bz2";
+    sha256 = "1qq7khilwkayrhwmzlxk83scrmiqfi7lgsn4c63znyvz2c1lgqxl";
+  };
+
+  # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
+  NROFF = "${groff}/bin/nroff";
+
+  buildInputs = ops useRailsExpress [ autoreconfHook bison ]
+    ++ (ops cursesSupport [ ncurses readline ] )
+    ++ (op docSupport groff )
+    ++ (op zlibSupport zlib)
+    ++ (op opensslSupport openssl)
+    ++ (op gdbmSupport gdbm);
+
+  patches = ops useRailsExpress [
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/01-ignore-generated-files.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/02-fix-tests-for-osx.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/03-sigvtalrm-fix.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/04-railsbench-gc-patch.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/05-display-full-stack-trace.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/06-better-source-file-tracing.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/07-heap-dump-support.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/08-fork-support-for-gc-logging.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/09-track-malloc-size.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/10-track-object-allocation.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/11-expose-heap-slots.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/12-fix-heap-size-growth-logic.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/13-heap-slot-size.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/14-add-trace-stats-enabled-methods.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/15-track-live-dataset-size.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/16-add-object-size-information-to-heap-dump.patch"
+    "${patchSet}/patches/ruby/1.8.7/p374/railsexpress/17-caller-for-all-threads.patch"
+  ];
+
+  configureFlags = [ "--enable-shared" "--enable-pthread" ]
+    ++ op useRailsExpress "--with-baseruby=${baseruby}/bin/ruby";
+
+  installFlags = stdenv.lib.optionalString docSupport "install-doc";
+
+  postInstall = ''
+    # Bundler tries to create this directory
+    mkdir -pv $out/${passthru.gemPath}
+    mkdir -p $out/nix-support
+    cat > $out/nix-support/setup-hook <<EOF
+    addGemPath() {
+      addToSearchPath GEM_PATH \$1/${passthru.gemPath}
+    }
+
+    envHooks+=(addGemPath)
+    EOF
+  '';
+
+  meta = {
+    license = "Ruby";
+    homepage = "http://www.ruby-lang.org/en/";
+    description = "The Ruby language";
+  };
+
+  passthru = rec {
+    majorVersion = "1";
+    minorVersion = "8";
+    teenyVersion = "7";
+    patchLevel = "374";
+    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
+    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+  };
+}
diff --git a/pkgs/development/interpreters/ruby/ruby-1.9.3.nix b/pkgs/development/interpreters/ruby/ruby-1.9.3.nix
new file mode 100644
index 000000000000..e361824bb532
--- /dev/null
+++ b/pkgs/development/interpreters/ruby/ruby-1.9.3.nix
@@ -0,0 +1,112 @@
+{ stdenv, fetchurl, fetchFromGitHub
+, zlib, zlibSupport ? true
+, openssl, opensslSupport ? true
+, gdbm, gdbmSupport ? true
+, ncurses, readline, cursesSupport ? false
+, groff, docSupport ? false
+, libyaml, yamlSupport ? true
+, ruby_1_9_3, autoreconfHook, bison, useRailsExpress ? true
+}:
+
+let
+  op = stdenv.lib.optional;
+  ops = stdenv.lib.optionals;
+  patchSet = import ./rvm-patchsets.nix { inherit fetchFromGitHub; };
+  baseruby = ruby_1_9_3.override { useRailsExpress = false; };
+in
+
+stdenv.mkDerivation rec {
+  version = with passthru; "${majorVersion}.${minorVersion}.${teenyVersion}-p${patchLevel}";
+
+  name = "ruby-${version}";
+
+  src = if useRailsExpress then fetchFromGitHub {
+    owner  = "ruby";
+    repo   = "ruby";
+    rev    = "v1_9_3_${passthru.patchLevel}";
+    sha256 = "040x67snfjrql5j7blizpm9j58jhwvh00v8h1h59aq90h52lkj68";
+  } else fetchurl {
+    url = "http://cache.ruby-lang.org/pub/ruby/1.9/${name}.tar.bz2";
+    sha256 = "0k7g0ahicjnd4sij2pml1p1dcb95ms3k3j1k3169n02kzz9qwn7g";
+  };
+
+  # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
+  NROFF = "${groff}/bin/nroff";
+
+  buildInputs = ops useRailsExpress [ autoreconfHook bison ]
+    ++ (ops cursesSupport [ ncurses readline ] )
+    ++ (op docSupport groff )
+    ++ (op zlibSupport zlib)
+    ++ (op opensslSupport openssl)
+    ++ (op gdbmSupport gdbm)
+    ++ (op yamlSupport libyaml)
+    # Looks like ruby fails to build on darwin without readline even if curses
+    # support is not enabled, so add readline to the build inputs if curses
+    # support is disabled (if it's enabled, we already have it) and we're
+    # running on darwin
+    ++ (op (!cursesSupport && stdenv.isDarwin) readline);
+
+  enableParallelBuilding = true;
+
+  patches = [
+    ./ruby19-parallel-install.patch
+    ./bitperfect-rdoc.patch
+  ] ++ ops useRailsExpress [
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/01-fix-make-clean.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/02-railsbench-gc.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/03-display-more-detailed-stack-trace.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/04-fork-support-for-gc-logging.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/05-track-live-dataset-size.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/06-webrick_204_304_keep_alive_fix.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/07-export-a-few-more-symbols-for-ruby-prof.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/08-thread-variables.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/09-faster-loading.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/10-falcon-st-opt.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/11-falcon-sparse-array.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/12-falcon-array-queue.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/13-railsbench-gc-fixes.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/14-show-full-backtrace-on-stack-overflow.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/15-configurable-fiber-stack-sizes.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/16-backport-psych-20.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/17-fix-missing-c-return-event.patch"
+    "${patchSet}/patches/ruby/1.9.3/p547/railsexpress/18-fix-process-daemon-call.patch"
+  ];
+
+  configureFlags = [ "--enable-shared" "--enable-pthread" ]
+    ++ op useRailsExpress "--with-baseruby=${baseruby}/bin/ruby"
+    # on darwin, we have /usr/include/tk.h -- so the configure script detects
+    # that tk is installed
+    ++ ( if stdenv.isDarwin then [ "--with-out-ext=tk " ] else [ ]);
+
+  installFlags = stdenv.lib.optionalString docSupport "install-doc";
+
+  postInstall = ''
+    # Bundler tries to create this directory
+    mkdir -pv $out/${passthru.gemPath}
+    mkdir -p $out/nix-support
+    cat > $out/nix-support/setup-hook <<EOF
+    addGemPath() {
+      addToSearchPath GEM_PATH \$1/${passthru.gemPath}
+    }
+
+    envHooks+=(addGemPath)
+    EOF
+  '';
+
+  meta = {
+    license     = "Ruby";
+    homepage    = "http://www.ruby-lang.org/en/";
+    description = "The Ruby language";
+    maintainers = with stdenv.lib.maintainers; [ lovek323 ];
+    platforms   = stdenv.lib.platforms.all;
+  };
+
+  passthru = rec {
+    majorVersion = "1";
+    minorVersion = "9";
+    teenyVersion = "3";
+    patchLevel = "547";
+    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
+    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+  };
+}
diff --git a/pkgs/development/interpreters/ruby/ruby-18.nix b/pkgs/development/interpreters/ruby/ruby-18.nix
deleted file mode 100644
index 356fce4913c1..000000000000
--- a/pkgs/development/interpreters/ruby/ruby-18.nix
+++ /dev/null
@@ -1,63 +0,0 @@
-{ stdenv, fetchurl
-, zlib, zlibSupport ? true
-, openssl, opensslSupport ? true
-, gdbm, gdbmSupport ? true
-, ncurses, readline, cursesSupport ? false
-, groff, docSupport ? false
-}:
-
-let
-  op = stdenv.lib.optional;
-  ops = stdenv.lib.optionals;
-in
-
-stdenv.mkDerivation rec {
-  version = with passthru; "${majorVersion}.${minorVersion}-p${patchLevel}";
-  
-  name = "ruby-${version}";
-  
-  src = fetchurl {
-    url = "http://cache.ruby-lang.org/pub/ruby/1.8/${name}.tar.bz2";
-    sha256 = "b4e34703137f7bfb8761c4ea474f7438d6ccf440b3d35f39cc5e4d4e239c07e3";
-  };
-
-  # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
-  NROFF = "${groff}/bin/nroff";
-
-  buildInputs = (ops cursesSupport [ ncurses readline ] )
-    ++ (op docSupport groff )
-    ++ (op zlibSupport zlib)
-    ++ (op opensslSupport openssl)
-    ++ (op gdbmSupport gdbm);
-    
-  configureFlags = ["--enable-shared" "--enable-pthread"];
-
-  installFlags = stdenv.lib.optionalString docSupport "install-doc";
-
-  postInstall = ''
-    # Bundler tries to create this directory
-    mkdir -pv $out/${passthru.gemPath}
-    mkdir -p $out/nix-support
-    cat > $out/nix-support/setup-hook <<EOF
-    addGemPath() {
-      addToSearchPath GEM_PATH \$1/${passthru.gemPath}
-    }
-
-    envHooks+=(addGemPath)
-    EOF
-  '';
-
-  meta = {
-    license = "Ruby";
-    homepage = "http://www.ruby-lang.org/en/";
-    description = "The Ruby language";
-  };
-
-  passthru = rec {
-    majorVersion = "1.8";
-    minorVersion = "7";
-    patchLevel = "374";
-    libPath = "lib/ruby/${majorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}";
-  };
-}
diff --git a/pkgs/development/interpreters/ruby/ruby-19.nix b/pkgs/development/interpreters/ruby/ruby-19.nix
deleted file mode 100644
index d18718184ba6..000000000000
--- a/pkgs/development/interpreters/ruby/ruby-19.nix
+++ /dev/null
@@ -1,80 +0,0 @@
-{ stdenv, fetchurl
-, zlib, zlibSupport ? true
-, openssl, opensslSupport ? true
-, gdbm, gdbmSupport ? true
-, ncurses, readline, cursesSupport ? false
-, groff, docSupport ? false
-, libyaml, yamlSupport ? true
-}:
-
-let
-  op = stdenv.lib.optional;
-  ops = stdenv.lib.optionals;
-in
-
-stdenv.mkDerivation rec {
-  version = with passthru; "${majorVersion}.${minorVersion}-p${patchLevel}";
-  
-  name = "ruby-${version}";
-  
-  src = fetchurl {
-    url = "http://cache.ruby-lang.org/pub/ruby/1.9/${name}.tar.bz2";
-    sha256 = "0fdc6e860d0023ba7b94c7a0cf1f7d32908b65b526246de9dfd5bb39d0d7922b";
-  };
-
-  # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
-  NROFF = "${groff}/bin/nroff";
-
-  buildInputs = (ops cursesSupport [ ncurses readline ] )
-    ++ (op docSupport groff )
-    ++ (op zlibSupport zlib)
-    ++ (op opensslSupport openssl)
-    ++ (op gdbmSupport gdbm)
-    ++ (op yamlSupport libyaml)
-    # Looks like ruby fails to build on darwin without readline even if curses
-    # support is not enabled, so add readline to the build inputs if curses
-    # support is disabled (if it's enabled, we already have it) and we're
-    # running on darwin
-    ++ (op (!cursesSupport && stdenv.isDarwin) readline);
-
-  enableParallelBuilding = true;
-  patches = [ ./ruby19-parallel-install.patch
-	      ./bitperfect-rdoc.patch
-  ];
-
-  configureFlags = [ "--enable-shared" "--enable-pthread" ]
-    # on darwin, we have /usr/include/tk.h -- so the configure script detects
-    # that tk is installed
-    ++ ( if stdenv.isDarwin then [ "--with-out-ext=tk " ] else [ ]);
-
-  installFlags = stdenv.lib.optionalString docSupport "install-doc";
-
-  postInstall = ''
-    # Bundler tries to create this directory
-    mkdir -pv $out/${passthru.gemPath}
-    mkdir -p $out/nix-support
-    cat > $out/nix-support/setup-hook <<EOF
-    addGemPath() {
-      addToSearchPath GEM_PATH \$1/${passthru.gemPath}
-    }
-
-    envHooks+=(addGemPath)
-    EOF
-  '';
-
-  meta = {
-    license     = "Ruby";
-    homepage    = "http://www.ruby-lang.org/en/";
-    description = "The Ruby language";
-    maintainers = with stdenv.lib.maintainers; [ lovek323 ];
-    platforms   = stdenv.lib.platforms.all;
-  };
-
-  passthru = rec {
-    majorVersion = "1.9";
-    minorVersion = "3";
-    patchLevel = "484";
-    libPath = "lib/ruby/${majorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}";
-  };
-}
diff --git a/pkgs/development/interpreters/ruby/ruby-2.0.nix b/pkgs/development/interpreters/ruby/ruby-2.0.0.nix
similarity index 56%
rename from pkgs/development/interpreters/ruby/ruby-2.0.nix
rename to pkgs/development/interpreters/ruby/ruby-2.0.0.nix
index ae242107b968..22b13717cfcb 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.0.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.0.0.nix
@@ -1,31 +1,40 @@
-{ stdenv, fetchurl
+{ stdenv, fetchurl, fetchFromGitHub
 , zlib, zlibSupport ? true
 , openssl, opensslSupport ? true
 , gdbm, gdbmSupport ? true
 , ncurses, readline, cursesSupport ? false
 , groff, docSupport ? false
 , libyaml, yamlSupport ? true
+, ruby_2_0_0, autoreconfHook, bison, useRailsExpress ? true
 }:
 
 let
   op = stdenv.lib.optional;
   ops = stdenv.lib.optionals;
+  patchSet = import ./rvm-patchsets.nix { inherit fetchFromGitHub; };
+  baseruby = ruby_2_0_0.override { useRailsExpress = false; };
 in
 
 stdenv.mkDerivation rec {
-  version = with passthru; "${majorVersion}.${minorVersion}-p${patchLevel}";
-  
+  version = with passthru; "${majorVersion}.${minorVersion}.${teenyVersion}-p${patchLevel}";
+
   name = "ruby-${version}";
-  
-  src = fetchurl {
+
+  src = if useRailsExpress then fetchFromGitHub {
+    owner  = "ruby";
+    repo   = "ruby";
+    rev    = "v2_0_0_${passthru.patchLevel}";
+    sha256 = "07ccnxgiqxn5ycmq2wl7j3aqmndm4n358y35kzaivb488ayjg3pj";
+  } else fetchurl {
     url = "http://cache.ruby-lang.org/pub/ruby/2.0/${name}.tar.bz2";
-    sha256 = "3de4e4d9aff4682fa4f8ed2b70bd0d746fae17452fc3d3a8e8f505ead9105ad9";
+    sha256 = "1qnqccyfhx0fykxqbzlxq0yvyvq6q9v32givyfyr303dx7bxlqh7";
   };
 
   # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
   NROFF = "${groff}/bin/nroff";
 
-  buildInputs = (ops cursesSupport [ ncurses readline ] )
+  buildInputs = ops useRailsExpress [ autoreconfHook bison ]
+    ++ (ops cursesSupport [ ncurses readline ] )
     ++ (op docSupport groff )
     ++ (op zlibSupport zlib)
     ++ (op opensslSupport openssl)
@@ -38,8 +47,17 @@ stdenv.mkDerivation rec {
     ++ (op (!cursesSupport && stdenv.isDarwin) readline);
 
   enableParallelBuilding = true;
-    
+
+  patches = ops useRailsExpress [
+    "${patchSet}/patches/ruby/2.0.0/p481/01-zero-broken-tests.patch"
+    "${patchSet}/patches/ruby/2.0.0/p481/02-railsexpress-gc.patch"
+    "${patchSet}/patches/ruby/2.0.0/p481/03-display-more-detailed-stack-trace.patch"
+    "${patchSet}/patches/ruby/2.0.0/p481/04-show-full-backtrace-on-stack-overflow.patch"
+    "${patchSet}/patches/ruby/2.0.0/p481/05-fix-missing-c-return-event.patch"
+  ];
+
   configureFlags = ["--enable-shared" ]
+    ++ op useRailsExpress "--with-baseruby=${baseruby}/bin/ruby"
     # on darwin, we have /usr/include/tk.h -- so the configure script detects
     # that tk is installed
     ++ ( if stdenv.isDarwin then [ "--with-out-ext=tk " ] else [ ]);
@@ -67,10 +85,11 @@ stdenv.mkDerivation rec {
   };
 
   passthru = rec {
-    majorVersion = "2.0";
+    majorVersion = "2";
     minorVersion = "0";
-    patchLevel = "353";
-    libPath = "lib/ruby/${majorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}";
+    teenyVersion = "0";
+    patchLevel = "481";
+    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
+    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/ruby-2.1.0.nix b/pkgs/development/interpreters/ruby/ruby-2.1.0.nix
new file mode 100644
index 000000000000..e0a9531d225d
--- /dev/null
+++ b/pkgs/development/interpreters/ruby/ruby-2.1.0.nix
@@ -0,0 +1,102 @@
+{ stdenv, fetchurl, fetchFromGitHub
+, zlib, zlibSupport ? true
+, openssl, opensslSupport ? true
+, gdbm, gdbmSupport ? true
+, ncurses, readline, cursesSupport ? false
+, groff, docSupport ? false
+, libyaml, yamlSupport ? true
+, ruby_2_1_0, autoreconfHook, bison, useRailsExpress ? true
+}:
+
+let
+  op = stdenv.lib.optional;
+  ops = stdenv.lib.optionals;
+  patchSet = import ./rvm-patchsets.nix { inherit fetchFromGitHub; };
+  baseruby = ruby_2_1_0.override { useRailsExpress = false; };
+in
+
+stdenv.mkDerivation rec {
+  version = with passthru; "${majorVersion}.${minorVersion}.${teenyVersion}-p${patchLevel}";
+
+  name = "ruby-${version}";
+
+  src = if useRailsExpress then fetchFromGitHub {
+    owner  = "ruby";
+    repo   = "ruby";
+    rev    = "v2_1_0";
+    sha256 = "12sn532yvznqfz85378ys0b9ggmj7w8ddhzc1pnnlx7mbyy7r2hx";
+  } else fetchurl {
+    url = "http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.gz";
+    sha256 = "17fhfbw8sr13rxfn58wvrhk2f5i88lkna2afn3gdjvprd8gyqf1m";
+  };
+
+  # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
+  NROFF = "${groff}/bin/nroff";
+
+  buildInputs = ops useRailsExpress [ autoreconfHook bison ]
+    ++ (ops cursesSupport [ ncurses readline ] )
+    ++ (op docSupport groff )
+    ++ (op zlibSupport zlib)
+    ++ (op opensslSupport openssl)
+    ++ (op gdbmSupport gdbm)
+    ++ (op yamlSupport libyaml)
+    # Looks like ruby fails to build on darwin without readline even if curses
+    # support is not enabled, so add readline to the build inputs if curses
+    # support is disabled (if it's enabled, we already have it) and we're
+    # running on darwin
+    ++ (op (!cursesSupport && stdenv.isDarwin) readline);
+
+  enableParallelBuilding = true;
+
+  patches = ops useRailsExpress [
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/01-current-2.1.1-fixes.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/02-zero-broken-tests.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/03-improve-gc-stats.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/04-display-more-detailed-stack-trace.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/05-show-full-backtrace-on-stack-overflow.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/06-fix-missing-c-return-event.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/07-backport-006e66b6680f60adfb434ee7397f0dbc77de7873.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/08-funny-falcon-stc-density.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/09-funny-falcon-stc-pool-allocation.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/10-aman-opt-aset-aref-str.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/11-funny-falcon-method-cache.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/12-backport-r44370.patch"
+  ];
+
+  configureFlags = ["--enable-shared" ]
+    ++ op useRailsExpress "--with-baseruby=${baseruby}/bin/ruby"
+    # on darwin, we have /usr/include/tk.h -- so the configure script detects
+    # that tk is installed
+    ++ ( if stdenv.isDarwin then [ "--with-out-ext=tk " ] else [ ]);
+
+  installFlags = stdenv.lib.optionalString docSupport "install-doc";
+  # Bundler tries to create this directory
+  postInstall = ''
+    # Bundler tries to create this directory
+    mkdir -pv $out/${passthru.gemPath}
+    mkdir -p $out/nix-support
+    cat > $out/nix-support/setup-hook <<EOF
+    addGemPath() {
+      addToSearchPath GEM_PATH \$1/${passthru.gemPath}
+    }
+
+    envHooks+=(addGemPath)
+    EOF
+  '';
+
+  meta = {
+    license = "Ruby";
+    homepage = "http://www.ruby-lang.org/en/";
+    description = "The Ruby language";
+    platforms = stdenv.lib.platforms.all;
+  };
+
+  passthru = rec {
+    majorVersion = "2";
+    minorVersion = "1";
+    teenyVersion = "0";
+    patchLevel = "0";
+    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
+    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+  };
+}
diff --git a/pkgs/development/interpreters/ruby/ruby-2.1.1.nix b/pkgs/development/interpreters/ruby/ruby-2.1.1.nix
new file mode 100644
index 000000000000..1a7a507f49c3
--- /dev/null
+++ b/pkgs/development/interpreters/ruby/ruby-2.1.1.nix
@@ -0,0 +1,101 @@
+{ stdenv, fetchurl, fetchFromGitHub
+, zlib, zlibSupport ? true
+, openssl, opensslSupport ? true
+, gdbm, gdbmSupport ? true
+, ncurses, readline, cursesSupport ? false
+, groff, docSupport ? false
+, libyaml, yamlSupport ? true
+, ruby_2_1_1, autoreconfHook, bison, useRailsExpress ? true
+}:
+
+let
+  op = stdenv.lib.optional;
+  ops = stdenv.lib.optionals;
+  patchSet = import ./rvm-patchsets.nix { inherit fetchFromGitHub; };
+  baseruby = ruby_2_1_1.override { useRailsExpress = false; };
+in
+
+stdenv.mkDerivation rec {
+  version = with passthru; "${majorVersion}.${minorVersion}.${teenyVersion}-p${patchLevel}";
+
+  name = "ruby-${version}";
+
+  src = if useRailsExpress then fetchFromGitHub {
+    owner  = "ruby";
+    repo   = "ruby";
+    rev    = "v2_1_1";
+    sha256 = "1v2ffvyd0xx1h1qd70431zczhvsdiyyw5kjxih4rszd5avzh5grl";
+  } else fetchurl {
+    url = "http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.1.tar.gz";
+    sha256 = "0hc9x3mazyvnk94gs19q8mbnanlzk8mv0hii77slkvc8mqqxyhy8";
+  };
+
+  # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
+  NROFF = "${groff}/bin/nroff";
+
+  buildInputs = ops useRailsExpress [ autoreconfHook bison ]
+    ++ (ops cursesSupport [ ncurses readline ] )
+    ++ (op docSupport groff )
+    ++ (op zlibSupport zlib)
+    ++ (op opensslSupport openssl)
+    ++ (op gdbmSupport gdbm)
+    ++ (op yamlSupport libyaml)
+    # Looks like ruby fails to build on darwin without readline even if curses
+    # support is not enabled, so add readline to the build inputs if curses
+    # support is disabled (if it's enabled, we already have it) and we're
+    # running on darwin
+    ++ (op (!cursesSupport && stdenv.isDarwin) readline);
+
+  enableParallelBuilding = true;
+
+  patches = ops useRailsExpress [
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/01-zero-broken-tests.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/02-improve-gc-stats.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/03-display-more-detailed-stack-trace.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/04-show-full-backtrace-on-stack-overflow.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/05-fix-missing-c-return-event.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/06-backport-006e66b6680f60adfb434ee7397f0dbc77de7873.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/07-funny-falcon-stc-density.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/08-funny-falcon-stc-pool-allocation.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/09-aman-opt-aset-aref-str.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/10-funny-falcon-method-cache.patch"
+    "${patchSet}/patches/ruby/2.1.0/railsexpress/11-backport-r44370.patch"
+  ];
+
+  configureFlags = ["--enable-shared" ]
+    ++ op useRailsExpress "--with-baseruby=${baseruby}/bin/ruby"
+    # on darwin, we have /usr/include/tk.h -- so the configure script detects
+    # that tk is installed
+    ++ ( if stdenv.isDarwin then [ "--with-out-ext=tk " ] else [ ]);
+
+  installFlags = stdenv.lib.optionalString docSupport "install-doc";
+  # Bundler tries to create this directory
+  postInstall = ''
+    # Bundler tries to create this directory
+    mkdir -pv $out/${passthru.gemPath}
+    mkdir -p $out/nix-support
+    cat > $out/nix-support/setup-hook <<EOF
+    addGemPath() {
+      addToSearchPath GEM_PATH \$1/${passthru.gemPath}
+    }
+
+    envHooks+=(addGemPath)
+    EOF
+  '';
+
+  meta = {
+    license = "Ruby";
+    homepage = "http://www.ruby-lang.org/en/";
+    description = "The Ruby language";
+    platforms = stdenv.lib.platforms.all;
+  };
+
+  passthru = rec {
+    majorVersion = "2";
+    minorVersion = "1";
+    teenyVersion = "1";
+    patchLevel = "0";
+    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
+    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
+  };
+}
diff --git a/pkgs/development/interpreters/ruby/ruby-2.1.2.nix b/pkgs/development/interpreters/ruby/ruby-2.1.2.nix
index 430bf4f16651..62159cb97860 100644
--- a/pkgs/development/interpreters/ruby/ruby-2.1.2.nix
+++ b/pkgs/development/interpreters/ruby/ruby-2.1.2.nix
@@ -1,28 +1,40 @@
-{ stdenv, fetchurl
+{ stdenv, fetchurl, fetchFromGitHub
 , zlib, zlibSupport ? true
 , openssl, opensslSupport ? true
 , gdbm, gdbmSupport ? true
 , ncurses, readline, cursesSupport ? false
 , groff, docSupport ? false
 , libyaml, yamlSupport ? true
+, ruby_2_1_2, autoreconfHook, bison, useRailsExpress ? true
 }:
 
 let
   op = stdenv.lib.optional;
   ops = stdenv.lib.optionals;
+  patchSet = import ./rvm-patchsets.nix { inherit fetchFromGitHub; };
+  baseruby = ruby_2_1_2.override { useRailsExpress = false; };
 in
 
 stdenv.mkDerivation rec {
-  name = "ruby-2.1.2";
-  src = fetchurl {
-    url = "http://cache.ruby-lang.org/pub/ruby/2.1/${name}.tar.bz2";
-    sha256 = "6948b02570cdfb89a8313675d4aa665405900e27423db408401473f30fc6e901";
+  version = with passthru; "${majorVersion}.${minorVersion}.${teenyVersion}-p${patchLevel}";
+
+  name = "ruby-${version}";
+
+  src = if useRailsExpress then fetchFromGitHub {
+    owner  = "ruby";
+    repo   = "ruby";
+    rev    = "v2_1_2";
+    sha256 = "14f8w3zwngnxsgigffh6h9z3ng53xq8mk126xmwrsmz9n3ypm6l0";
+  } else fetchurl {
+    url = "http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.2.tar.gz";
+    sha256 = "0db6krc2bd7yha8p96lcqrahjpsz7g7abhni134g708sh53n8apj";
   };
 
   # Have `configure' avoid `/usr/bin/nroff' in non-chroot builds.
   NROFF = "${groff}/bin/nroff";
 
-  buildInputs = (ops cursesSupport [ ncurses readline ] )
+  buildInputs = ops useRailsExpress [ autoreconfHook bison ]
+    ++ (ops cursesSupport [ ncurses readline ] )
     ++ (op docSupport groff )
     ++ (op zlibSupport zlib)
     ++ (op opensslSupport openssl)
@@ -36,7 +48,21 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
+  patches = ops useRailsExpress [
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/01-zero-broken-tests.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/02-improve-gc-stats.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/03-display-more-detailed-stack-trace.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/04-show-full-backtrace-on-stack-overflow.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/05-fix-missing-c-return-event.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/06-backport-006e66b6680f60adfb434ee7397f0dbc77de7873.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/07-funny-falcon-stc-density.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/08-funny-falcon-stc-pool-allocation.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/09-aman-opt-aset-aref-str.patch"
+    "${patchSet}/patches/ruby/2.1.2/railsexpress/10-funny-falcon-method-cache.patch"
+  ];
+
   configureFlags = ["--enable-shared" ]
+    ++ op useRailsExpress "--with-baseruby=${baseruby}/bin/ruby"
     # on darwin, we have /usr/include/tk.h -- so the configure script detects
     # that tk is installed
     ++ ( if stdenv.isDarwin then [ "--with-out-ext=tk " ] else [ ]);
@@ -64,9 +90,11 @@ stdenv.mkDerivation rec {
   };
 
   passthru = rec {
-    majorVersion = "2.1";
-    minorVersion = "2";
-    libPath = "lib/ruby/${majorVersion}";
-    gemPath = "lib/ruby/gems/${majorVersion}";
+    majorVersion = "2";
+    minorVersion = "1";
+    teenyVersion = "2";
+    patchLevel = "353";
+    libPath = "lib/ruby/${majorVersion}.${minorVersion}";
+    gemPath = "lib/ruby/gems/${majorVersion}.${minorVersion}";
   };
 }
diff --git a/pkgs/development/interpreters/ruby/rvm-patchsets.nix b/pkgs/development/interpreters/ruby/rvm-patchsets.nix
new file mode 100644
index 000000000000..dca74dca62ed
--- /dev/null
+++ b/pkgs/development/interpreters/ruby/rvm-patchsets.nix
@@ -0,0 +1,8 @@
+{ fetchFromGitHub }:
+
+fetchFromGitHub {
+  owner  = "skaes";
+  repo   = "rvm-patchsets";
+  rev    = "13d535bbc060b1b8166673932fe7098abf4216b8";
+  sha256 = "0hf1m2bsdgdnyi4427gknvpd8cfribw77lf2k980flb1z9g5d7ib";
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f2a126827b53..02c6e11a8b67 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3820,12 +3820,19 @@ let
     wrapPython = pythonPackages.wrapPython;
   };
 
-  ruby18 = callPackage ../development/interpreters/ruby/ruby-18.nix { };
-  ruby19 = callPackage ../development/interpreters/ruby/ruby-19.nix { };
-  ruby2 = lowPrio (callPackage ../development/interpreters/ruby/ruby-2.0.nix { });
-  ruby21 = callPackage ../development/interpreters/ruby/ruby-2.1.2.nix { };
+  ruby_1_8_7 = callPackage ../development/interpreters/ruby/ruby-1.8.7.nix { };
+  ruby_1_9_3 = callPackage ../development/interpreters/ruby/ruby-1.9.3.nix { };
+  ruby_2_0_0 = lowPrio (callPackage ../development/interpreters/ruby/ruby-2.0.0.nix { });
+  ruby_2_1_0 = lowPrio (callPackage ../development/interpreters/ruby/ruby-2.1.0.nix { });
+  ruby_2_1_1 = lowPrio (callPackage ../development/interpreters/ruby/ruby-2.1.1.nix { });
+  ruby_2_1_2 = lowPrio (callPackage ../development/interpreters/ruby/ruby-2.1.2.nix { });
 
-  ruby = ruby19;
+  # Ruby aliases
+  ruby = ruby_1_9;
+  ruby_1_8 = ruby_1_8_7;
+  ruby_1_9 = ruby_1_9_3;
+  ruby_2_0 = ruby_2_0_0;
+  ruby_2_1 = ruby_2_1_2;
 
   rubyLibs = recurseIntoAttrs (callPackage ../development/interpreters/ruby/libs.nix { });
 
@@ -4391,7 +4398,7 @@ let
   uncrustify = callPackage ../development/tools/misc/uncrustify { };
 
   vagrant = callPackage ../development/tools/vagrant {
-    ruby = ruby2;
+    ruby = ruby_2_0_0;
   };
 
   gdb = callPackage ../development/tools/misc/gdb {
@@ -9575,7 +9582,7 @@ let
   pcmanfm = callPackage ../applications/misc/pcmanfm { };
 
   ruby_gpgme = callPackage ../development/libraries/ruby_gpgme {
-    ruby = ruby19;
+    ruby = ruby_1_9_3;
     hoe = rubyLibs.hoe;
   };
 
@@ -9586,7 +9593,7 @@ let
   smplayer = callPackage ../applications/video/smplayer { };
 
   sup = with rubyLibs; callPackage ../applications/networking/mailreaders/sup {
-    ruby = ruby19.override {
+    ruby = ruby_1_9_3.override {
       cursesSupport = true;
     };