diff --git a/plugins/python-build/bin/pyenv-install b/plugins/python-build/bin/pyenv-install
index 68e5368b..35b450a7 100755
--- a/plugins/python-build/bin/pyenv-install
+++ b/plugins/python-build/bin/pyenv-install
@@ -148,6 +148,14 @@ if [ -z "${PYTHON_BUILD_CACHE_PATH}" ] && [ -d "${PYENV_ROOT}/cache" ]; then
   export PYTHON_BUILD_CACHE_PATH="${PYENV_ROOT}/cache"
 fi
 
+# Default PYENV_VERSION to the globally-specified Python version. (The
+# Python 3.4 installer requires an existing Python installation to run. An
+# unsatisfied local .python-version file can cause the installer to
+# fail.)
+if [ -z "${PYENV_VERSION}" ]; then
+  export PYENV_VERSION="$(pyenv global 2>/dev/null || true)"
+fi
+
 
 # Execute `before_install` hooks.
 for hook in "${before_hooks[@]}"; do eval "$hook"; done
diff --git a/plugins/python-build/bin/python-build b/plugins/python-build/bin/python-build
index c7f17595..bf3f83fd 100755
--- a/plugins/python-build/bin/python-build
+++ b/plugins/python-build/bin/python-build
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-PYTHON_BUILD_VERSION="20121023"
+PYTHON_BUILD_VERSION="20130518"
 
 set -E
 exec 3<&2 # preserve original stderr at fd 3
@@ -61,6 +61,10 @@ capitalize() {
   printf "%s" "$1" | tr a-z A-Z
 }
 
+sanitize() {
+  printf "%s" "$1" | sed "s/[^A-Za-z0-9.-]/_/g; s/__*/_/g"
+}
+
 build_failed() {
   { echo
     echo "BUILD FAILED"
@@ -100,6 +104,10 @@ install_git() {
   install_package_using "git" 2 "$@"
 }
 
+install_hg() {
+  install_package_using "hg" 2 "$@"
+}
+
 install_svn() {
   install_package_using "svn" 2 "$@"
 }
@@ -330,6 +338,20 @@ fetch_git() {
   echo "Cloning ${git_url}..." >&2
 
   if type git &>/dev/null; then
+    if [ -n "$PYTHON_BUILD_CACHE_PATH" ]; then
+      pushd "$PYTHON_BUILD_CACHE_PATH" >&4
+      local clone_name="$(sanitize "$git_url")"
+      if [ -e "${clone_name}" ]; then
+        { cd "${clone_name}"
+          git fetch --force "$git_url" "+${git_ref}:${git_ref}"
+        } >&4 2>&1
+      else
+        git clone --bare --branch "$git_ref" "$git_url" "${clone_name}" >&4 2>&1
+      fi
+      git_url="$PYTHON_BUILD_CACHE_PATH/${clone_name}"
+      popd >&4
+    fi
+
     git clone --depth 1 --branch "$git_ref" "$git_url" "${package_name}" >&4 2>&1
   else
     echo "error: please install \`git\` and try again" >&2
@@ -337,6 +359,38 @@ fetch_git() {
   fi
 }
 
+fetch_hg() {
+  local package_name="$1"
+  local hg_url="$2"
+  local hg_ref="$3"
+
+  echo "Cloning ${hg_url}..." >&2
+
+  if type hg &>/dev/null; then
+    if [ -n "$PYTHON_BUILD_CACHE_PATH" ]; then
+      pushd "$PYTHON_BUILD_CACHE_PATH" >&4
+      local clone_name="$(sanitize "$hg_url")"
+      if [ -e "${clone_name}" ]; then
+        { cd "${clone_name}"
+          hg pull --force "$hg_url"
+        } >&4 2>&1
+      else
+        { hg clone --branch "$hg_ref" "$hg_url" "${clone_name}"
+          cd "${clone_name}"
+          hg update null
+        } >&4 2>&1
+      fi
+      hg_url="$PYTHON_BUILD_CACHE_PATH/${clone_name}"
+      popd >&4
+    fi
+
+    hg clone --branch "$hg_ref" "$hg_url" "${package_name}" >&4 2>&1
+  else
+    echo "error: please install \`hg\` and try again" >&2
+    exit 1
+  fi
+}
+
 fetch_svn() {
   local package_name="$1"
   local svn_url="$2"
@@ -476,8 +530,13 @@ build_package_standard() {
   local PACKAGE_MAKE_OPTS_ARRAY="${package_var_name}_MAKE_OPTS_ARRAY[@]"
   local PACKAGE_CFLAGS="${package_var_name}_CFLAGS"
 
-  { CFLAGS="$CFLAGS ${!PACKAGE_CFLAGS}" ${!PACKAGE_CONFIGURE:-./configure} --prefix="${!PACKAGE_PREFIX_PATH:-$PREFIX_PATH}" $CONFIGURE_OPTS ${!PACKAGE_CONFIGURE_OPTS} "${!PACKAGE_CONFIGURE_OPTS_ARRAY}"
-    "$MAKE" $MAKE_OPTS ${!PACKAGE_MAKE_OPTS} "${!PACKAGE_MAKE_OPTS_ARRAY}"
+  ( if [ "${CFLAGS+defined}" ] || [ "${!PACKAGE_CFLAGS+defined}" ]; then
+      export CFLAGS="$CFLAGS ${!PACKAGE_CFLAGS}"
+    fi
+    ${!PACKAGE_CONFIGURE:-./configure} --prefix="${!PACKAGE_PREFIX_PATH:-$PREFIX_PATH}" $CONFIGURE_OPTS ${!PACKAGE_CONFIGURE_OPTS} "${!PACKAGE_CONFIGURE_OPTS_ARRAY}"
+  ) >&4 2>&1
+
+  { "$MAKE" $MAKE_OPTS ${!PACKAGE_MAKE_OPTS} "${!PACKAGE_MAKE_OPTS_ARRAY}"
     "$MAKE" install
   } >&4 2>&1
 
diff --git a/plugins/python-build/share/python-build/2.6-dev b/plugins/python-build/share/python-build/2.6-dev
new file mode 100644
index 00000000..16370d4f
--- /dev/null
+++ b/plugins/python-build/share/python-build/2.6-dev
@@ -0,0 +1,3 @@
+install_hg "Python-2.6-dev" "https://bitbucket.org/mirror/cpython" "2.6" standard verify_py26
+install_package "distribute-0.6.40" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.40.tar.gz#7a2dd4033999af22fe9591fa84f3e599" python
+install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
diff --git a/plugins/python-build/share/python-build/2.7-dev b/plugins/python-build/share/python-build/2.7-dev
new file mode 100644
index 00000000..f7c3eba8
--- /dev/null
+++ b/plugins/python-build/share/python-build/2.7-dev
@@ -0,0 +1,3 @@
+install_hg "Python-2.7-dev" "https://bitbucket.org/mirror/cpython" "2.7" standard verify_py27
+install_package "distribute-0.6.40" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.40.tar.gz#7a2dd4033999af22fe9591fa84f3e599" python
+install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
diff --git a/plugins/python-build/share/python-build/3.1-dev b/plugins/python-build/share/python-build/3.1-dev
new file mode 100644
index 00000000..aafea1e3
--- /dev/null
+++ b/plugins/python-build/share/python-build/3.1-dev
@@ -0,0 +1,3 @@
+install_hg "Python-3.1-dev" "https://bitbucket.org/mirror/cpython" "3.1" standard verify_py3
+install_package "distribute-0.6.40" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.40.tar.gz#7a2dd4033999af22fe9591fa84f3e599" python
+install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
diff --git a/plugins/python-build/share/python-build/3.2-dev b/plugins/python-build/share/python-build/3.2-dev
new file mode 100644
index 00000000..46adb16d
--- /dev/null
+++ b/plugins/python-build/share/python-build/3.2-dev
@@ -0,0 +1,3 @@
+install_hg "Python-3.2-dev" "https://bitbucket.org/mirror/cpython" "3.2" standard verify_py3
+install_package "distribute-0.6.40" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.40.tar.gz#7a2dd4033999af22fe9591fa84f3e599" python
+install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
diff --git a/plugins/python-build/share/python-build/3.3-dev b/plugins/python-build/share/python-build/3.3-dev
new file mode 100644
index 00000000..11ca617b
--- /dev/null
+++ b/plugins/python-build/share/python-build/3.3-dev
@@ -0,0 +1,3 @@
+install_hg "Python-3.3-dev" "https://bitbucket.org/mirror/cpython" "3.3" standard verify_py3
+install_package "distribute-0.6.40" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.40.tar.gz#7a2dd4033999af22fe9591fa84f3e599" python
+install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
diff --git a/plugins/python-build/share/python-build/3.4-dev b/plugins/python-build/share/python-build/3.4-dev
new file mode 100644
index 00000000..ddedca5d
--- /dev/null
+++ b/plugins/python-build/share/python-build/3.4-dev
@@ -0,0 +1,3 @@
+install_hg "Python-3.4-dev" "https://bitbucket.org/mirror/cpython" "default" standard verify_py3
+install_package "distribute-0.6.40" "http://pypi.python.org/packages/source/d/distribute/distribute-0.6.40.tar.gz#7a2dd4033999af22fe9591fa84f3e599" python
+install_package "pip-1.3.1" "http://pypi.python.org/packages/source/p/pip/pip-1.3.1.tar.gz#cbb27a191cebc58997c4da8513863153" python
diff --git a/plugins/python-build/share/python-build/patches/2.6-dev/Python-2.6-dev/000_patch-setup.py.diff b/plugins/python-build/share/python-build/patches/2.6-dev/Python-2.6-dev/000_patch-setup.py.diff
new file mode 100644
index 00000000..b2998bca
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/2.6-dev/Python-2.6-dev/000_patch-setup.py.diff
@@ -0,0 +1,47 @@
+
+# HG changeset patch
+# User Barry Warsaw <barry@python.org>
+# Date 1302190091 14400
+# Node ID bd0f73a9538e05f526feaf05821e68bdcff498fa
+# Parent  2e4cdaffe493e879fb5367a4aa454491de451137
+Backport for Python 2.7 of issue 11715 support for building Python on
+multiarch Debian/Ubuntu.
+
+diff --git a/setup.py b/setup.py
+--- setup.py.orig
++++ setup.py
+@@ -345,10 +345,33 @@ class PyBuildExt(build_ext):
+                 return platform
+         return sys.platform
+ 
++    def add_multiarch_paths(self):
++        # Debian/Ubuntu multiarch support.
++        # https://wiki.ubuntu.com/MultiarchSpec
++        if not find_executable('dpkg-architecture'):
++            return
++        tmpfile = os.path.join(self.build_temp, 'multiarch')
++        if not os.path.exists(self.build_temp):
++            os.makedirs(self.build_temp)
++        ret = os.system(
++            'dpkg-architecture -qDEB_HOST_MULTIARCH > %s 2> /dev/null' %
++            tmpfile)
++        try:
++            if ret >> 8 == 0:
++                with open(tmpfile) as fp:
++                    multiarch_path_component = fp.readline().strip()
++                add_dir_to_list(self.compiler.library_dirs,
++                                '/usr/lib/' + multiarch_path_component)
++                add_dir_to_list(self.compiler.include_dirs,
++                                '/usr/include/' + multiarch_path_component)
++        finally:
++            os.unlink(tmpfile)
++
+     def detect_modules(self):
+         # Ensure that /usr/local is always used
+         add_dir_to_list(self.compiler.library_dirs, '/usr/local/lib')
+         add_dir_to_list(self.compiler.include_dirs, '/usr/local/include')
++        self.add_multiarch_paths()
+ 
+         # Add paths specified in the environment variables LDFLAGS and
+         # CPPFLAGS for header and library files.
+
diff --git a/plugins/python-build/share/python-build/patches/2.6-dev/Python-2.6-dev/001_openssl_no_ssl2.patch b/plugins/python-build/share/python-build/patches/2.6-dev/Python-2.6-dev/001_openssl_no_ssl2.patch
new file mode 100644
index 00000000..7304deb4
--- /dev/null
+++ b/plugins/python-build/share/python-build/patches/2.6-dev/Python-2.6-dev/001_openssl_no_ssl2.patch
@@ -0,0 +1,77 @@
+diff -r -u ./Lib/ssl.py ../Python-2.6.8/Lib/ssl.py
+--- ./Lib/ssl.py	2012-04-11 00:32:06.000000000 +0900
++++ ../Python-2.6.8/Lib/ssl.py	2013-05-08 19:44:49.000000000 +0900
+@@ -61,7 +61,19 @@
+ 
+ from _ssl import SSLError
+ from _ssl import CERT_NONE, CERT_OPTIONAL, CERT_REQUIRED
+-from _ssl import PROTOCOL_SSLv2, PROTOCOL_SSLv3, PROTOCOL_SSLv23, PROTOCOL_TLSv1
++from _ssl import PROTOCOL_SSLv3, PROTOCOL_SSLv23, PROTOCOL_TLSv1
++_PROTOCOL_NAMES = {
++    PROTOCOL_TLSv1: "TLSv1",
++    PROTOCOL_SSLv23: "SSLv23",
++    PROTOCOL_SSLv3: "SSLv3",
++}
++try:
++    from _ssl import PROTOCOL_SSLv2
++    _SSLv2_IF_EXISTS = PROTOCOL_SSLv2
++except ImportError:
++    _SSLv2_IF_EXISTS = None
++else:
++    _PROTOCOL_NAMES[PROTOCOL_SSLv2] = "SSLv2"
+ from _ssl import RAND_status, RAND_egd, RAND_add
+ from _ssl import \
+      SSL_ERROR_ZERO_RETURN, \
+@@ -402,16 +414,7 @@
+     return DER_cert_to_PEM_cert(dercert)
+ 
+ def get_protocol_name(protocol_code):
+-    if protocol_code == PROTOCOL_TLSv1:
+-        return "TLSv1"
+-    elif protocol_code == PROTOCOL_SSLv23:
+-        return "SSLv23"
+-    elif protocol_code == PROTOCOL_SSLv2:
+-        return "SSLv2"
+-    elif protocol_code == PROTOCOL_SSLv3:
+-        return "SSLv3"
+-    else:
+-        return "<unknown>"
++    return _PROTOCOL_NAMES.get(protocol_code, '<unknown>')
+ 
+ 
+ # a replacement for the old socket.ssl function
+diff -r -u ./Modules/_ssl.c ../Python-2.6.8/Modules/_ssl.c
+--- ./Modules/_ssl.c	2012-04-11 00:32:09.000000000 +0900
++++ ../Python-2.6.8/Modules/_ssl.c	2013-05-08 17:34:38.000000000 +0900
+@@ -62,7 +62,9 @@
+ };
+ 
+ enum py_ssl_version {
++#ifndef OPENSSL_NO_SSL2
+     PY_SSL_VERSION_SSL2,
++#endif
+     PY_SSL_VERSION_SSL3,
+     PY_SSL_VERSION_SSL23,
+     PY_SSL_VERSION_TLS1
+@@ -302,8 +304,10 @@
+         self->ctx = SSL_CTX_new(TLSv1_method()); /* Set up context */
+     else if (proto_version == PY_SSL_VERSION_SSL3)
+         self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */
++#ifndef OPENSSL_NO_SSL2
+     else if (proto_version == PY_SSL_VERSION_SSL2)
+         self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */
++#endif
+     else if (proto_version == PY_SSL_VERSION_SSL23)
+         self->ctx = SSL_CTX_new(SSLv23_method()); /* Set up context */
+     PySSL_END_ALLOW_THREADS
+@@ -1688,8 +1692,10 @@
+                             PY_SSL_CERT_REQUIRED);
+ 
+     /* protocol versions */
++#ifndef OPENSSL_NO_SSL2
+     PyModule_AddIntConstant(m, "PROTOCOL_SSLv2",
+                             PY_SSL_VERSION_SSL2);
++#endif
+     PyModule_AddIntConstant(m, "PROTOCOL_SSLv3",
+                             PY_SSL_VERSION_SSL3);
+     PyModule_AddIntConstant(m, "PROTOCOL_SSLv23",