diff --git a/.appveyor.yml b/.appveyor.yml
index 20bf88bb..d0c39078 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -28,7 +28,7 @@ install:
     - ps: Push-AppveyorArtifact cygcheck.log
     - ps: |
         if ($env:build_with -eq "cmake") {
-          $env:cfg_suffix = ".py"
+          $env:cfg_suffix = ".sh"
           $env:unittest = "unittest"
           $env:inttest = "inttest"
         } else {
diff --git a/.travis.yml b/.travis.yml
index c22be810..baead2e1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,7 +40,7 @@ before_install:
     - if [[ "$BUILD_TYPE" == "asan" ]]; then export CFGFLAGS=--enable-debug MYCXXFLAGS="-fsanitize=address -O1 -fno-omit-frame-pointer -fno-optimize-sibling-calls -fPIE" MYLDFLAGS="-fsanitize=address -pie"; fi
     - if [[ "$BUILD_TYPE" == "tsan" ]]; then export CFGFLAGS=--enable-debug MYCXXFLAGS="-fsanitize=thread -O1 -fPIE" MYLDFLAGS="-fsanitize=thread -pie"; fi
     - if [[ "$BUILD_TYPE" == "coverage" ]]; then export CFGFLAGS="--enable-debug --disable-perl --disable-python" MYCXXFLAGS=--coverage MYLDFLAGS=--coverage DISABLED_ZNC_PERL_PYTHON_TEST=1; fi
-    - if [[ "$BUILD_WITH" == "cmake" ]]; then export CFGSUFFIX=.py UNITTEST=unittest INTTEST=inttest; else export CFGSUFFIX= UNITTEST=test INTTEST=test2; fi
+    - if [[ "$BUILD_WITH" == "cmake" ]]; then export CFGSUFFIX=.sh UNITTEST=unittest INTTEST=inttest; else export CFGSUFFIX= UNITTEST=test INTTEST=test2; fi
       # UBSan randomly crashes clang, and very often :(
       # CFGFLAGS=--enable-debug MYCXXFLAGS="-fsanitize=undefined -O1 -fPIE -fno-sanitize-recover" MYLDFLAGS="-fsanitize=undefined -pie -fno-sanitize-recover"
     - if [[ "$TRAVIS_REPO_SLUG" == "znc/znc" && "$TRAVIS_PULL_REQUEST" == "false" && "$TRAVIS_BRANCH" == "master" ]]; then openssl aes-256-cbc -d -in .travis-github.enc -out ~/znc-github-key -k ${SECRET_KEY}; fi
diff --git a/README.md b/README.md
index e335c6ac..7a216065 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ Character Encodings:
 
 Currently there are 2 build systems in place: CMake and `./configure`.
 `./configure` will eventually be removed.
-There is also `configure.py` which should make migration to CMake easier:
+There is also `configure.sh` which should make migration to CMake easier:
 it accepts the same parameters as `./configure`,
 but calls CMake with CMake-style parameters.
 
diff --git a/configure.py b/configure.sh
similarity index 89%
rename from configure.py
rename to configure.sh
index 8bc6c37c..54d28a35 100755
--- a/configure.py
+++ b/configure.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/bin/sh
 #
 # Copyright (C) 2004-2016 ZNC, see the NOTICE file for details.
 #
@@ -15,6 +15,15 @@
 # limitations under the License.
 #
 
+# http://stackoverflow.com/questions/18993438/shebang-env-preferred-python-version
+# http://stackoverflow.com/questions/12070516/conditional-shebang-line-for-different-versions-of-python
+""":"
+which python3 >/dev/null 2>&1 && exec python3 "$0" "$@"
+which python  >/dev/null 2>&1 && exec python  "$0" "$@"
+which python2 >/dev/null 2>&1 && exec python2 "$0" "$@"
+echo "Error: configure wrapper requires python"
+exec echo "Either install python, or use cmake directly"
+":"""
 
 import argparse
 import os
diff --git a/znc-buildmod.cmake.in b/znc-buildmod.cmake.in
index 3dfaeb7e..dd519f71 100755
--- a/znc-buildmod.cmake.in
+++ b/znc-buildmod.cmake.in
@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/bin/sh
 #
 # Copyright (C) 2004-2016 ZNC, see the NOTICE file for details.
 #
@@ -15,14 +15,35 @@
 # limitations under the License.
 #
 
+# http://stackoverflow.com/questions/18993438/shebang-env-preferred-python-version
+# http://stackoverflow.com/questions/12070516/conditional-shebang-line-for-different-versions-of-python
+""":"
+which python3 >/dev/null 2>&1 && exec python3 "$0" "$@"
+which python  >/dev/null 2>&1 && exec python  "$0" "$@"
+which python2 >/dev/null 2>&1 && exec python2 "$0" "$@"
+echo "Error: znc-buildmod requires python"
+exec echo "Either install python, or use cmake directly"
+":"""
+
+from __future__ import print_function
 
 import argparse
 import glob
 import os
 import shutil
 import subprocess
+import sys
 import tempfile
 
+if sys.version_info < (3, 0):
+    class TemporaryDirectory(object):
+        def __enter__(self):
+            self.name = tempfile.mkdtemp()
+            return self.name
+        def __exit__(self, *a, **k):
+            shutil.rmtree(self.name)
+    tempfile.TemporaryDirectory = TemporaryDirectory
+
 parser = argparse.ArgumentParser(
         description='Build external ZNC modules and place the results to '
         'current directory. Several modules can be built at once.',