diff --git a/.gitignore b/.gitignore
index e809549..d657fc6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
+*.egg-info/
 *.pyc
 *.pyo
+.tox/
 /*.html
+build/
+dist/
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..96e6c17
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,7 @@
+include completions/git-imerge
+include COPYING
+include t/create-test-repo
+include t/test-conflicted
+include t/test-drop
+include t/test-unconflicted
+include tox.ini
diff --git a/Makefile b/Makefile
index 672f69d..7eb4995 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,3 @@
-
-BIN=git-imerge
-PREFIX=/usr/local
-
 RST := \
     README.rst \
     TODO.rst
@@ -20,13 +16,3 @@ html: $(module)/talk.html
 
 $(module)/talk.html: $(module)/talk.rst
 	rst2s5 --theme=small-white --current-slide $< $@
-
-install: $(BIN)
-	@mkdir -p $(DESTDIR)$(PREFIX)/bin
-	install $(BIN) $(DESTDIR)$(PREFIX)/bin
-	@mkdir -p $(DESTDIR)/etc/bash_completion.d
-	cp -f git-imerge.bashcomplete $(DESTDIR)/etc/bash_completion.d/git-imerge
-
-uninstall:
-	rm $(DESTDIR)$(PREFIX)/bin/$(BIN)
-	rm -f $(DESTDIR)/etc/bash_completion.d/git-imerge
diff --git a/README.rst b/README.rst
index 93857ec..ec3d219 100644
--- a/README.rst
+++ b/README.rst
@@ -48,9 +48,8 @@ command.
 An incremental merge can be interrupted and resumed arbitrarily, or
 even pushed to a server to allow somebody else to work on it.
 
-``git-imerge`` comes with a Bash completion script. It can be installed
-by copying ``git-imerge.bashcomplete`` to the place where usually completion
-scripts are installed on your system, e.g. /etc/bash_completion.d/.
+``git-imerge`` comes with a Bash completion script, ``completions/git-imerge``,
+that is installed automatically when installing ``git-imerge``.
 
 
 Requirements
@@ -66,16 +65,24 @@ Requirements
 
   * Python 3.x, version 3.3 or later.
 
-  The script tries to use a Python interpreter called ``python`` in
-  your ``PATH``.  If your Python interpreter has a different name or
-  is not in your ``PATH``, please adjust the first line of the script
-  accordingly.
-
 * A recent version of Git.
 
 Bash completion requires Git's completion being available.
 
 
+Installation
+============
+
+``git-imerge`` is available on PyPI_, so you can install it with ``pip``::
+
+    $ pip install git-imerge
+
+
+or using ``setup.py`` if you have downloaded the source package locally::
+
+    $ python setup.py install
+
+
 Instructions
 ============
 
@@ -399,6 +406,22 @@ line or change the default in your configuration::
     git config --global imerge.editmergemessages true
 
 
+Testing
+=======
+
+``git-imerge`` uses tox_ to run tests. To run the test suite with the system's
+default Python::
+
+    $ tox
+
+To run with a specific Python version, such as 3.7, pass the ``-e`` argument to
+tox::
+
+    $ tox -e py37
+
+.. _tox: https://tox.readthedocs.io/
+
+
 License
 =======
 
@@ -423,5 +446,3 @@ References
    * http://softwareswirl.blogspot.com/2009/04/truce-in-merge-vs-rebase-war.html
    * http://softwareswirl.blogspot.com/2009/08/upstream-rebase-just-works-if-history.html
    * http://softwareswirl.blogspot.com/2009/08/rebase-with-history-implementation.html
-
-
diff --git a/git-imerge.bashcomplete b/completions/git-imerge
similarity index 100%
rename from git-imerge.bashcomplete
rename to completions/git-imerge
diff --git a/git-imerge b/gitimerge.py
old mode 100755
new mode 100644
similarity index 99%
rename from git-imerge
rename to gitimerge.py
index 743fa24..fe99c30
--- a/git-imerge
+++ b/gitimerge.py
@@ -1,4 +1,3 @@
-#! /usr/bin/env python
 # -*- coding: utf-8 -*-
 
 # Copyright 2012-2013 Michael Haggerty <mhagger@alum.mit.edu>
@@ -4137,11 +4136,15 @@ def main(args):
         parser.error('Unrecognized subcommand')
 
 
-if __name__ == '__main__':
+def climain():
     try:
         main(sys.argv[1:])
     except Failure as e:
         sys.exit(str(e))
 
 
+if __name__ == "__main__":
+    climain()
+
+
 # vim: set expandtab ft=python:
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..4b346a5
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,44 @@
+import errno
+import subprocess
+
+from setuptools import setup
+
+data_files = []
+try:
+    completionsdir = subprocess.check_output(
+        ["pkg-config", "--variable=completionsdir", "bash-completion"]
+    )
+except OSError as e:
+    if e.errno != errno.ENOENT:
+        raise
+else:
+    completionsdir = completionsdir.strip().decode('utf-8')
+    if completionsdir:
+        data_files.append((completionsdir, ["completions/git-imerge"]))
+
+
+setup(
+    name="gitimerge",
+    description="Incremental merge for git",
+    url="https://github.com/mhagger/git-imerge",
+    author="Michael Haggerty",
+    author_email="mhagger@alum.mit.edu",
+    license="GPLv2+",
+    version="1.1.0",
+    py_modules=["gitimerge"],
+    data_files=data_files,
+    entry_points={"console_scripts": ["git-imerge = gitimerge:climain"]},
+    python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
+    classifiers=[
+        "Development Status :: 5 - Production/Stable",
+        "License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)",
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 2",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+    ],
+)
diff --git a/t/reset-test-repo b/t/reset-test-repo
index f0a938c..fb9adc3 100755
--- a/t/reset-test-repo
+++ b/t/reset-test-repo
@@ -2,7 +2,7 @@
 
 BASE="$(dirname "$(cd $(dirname "$0") && pwd)")"
 TMP="$BASE/t/tmp/main"
-GIT_IMERGE="$BASE/git-imerge"
+GIT_IMERGE="git-imerge"
 
 cd "$TMP"
 
diff --git a/t/test-conflicted b/t/test-conflicted
index 16d1f4d..4927e10 100755
--- a/t/test-conflicted
+++ b/t/test-conflicted
@@ -7,7 +7,7 @@ set -x
 
 BASE="$(dirname "$(cd $(dirname "$0") && pwd)")"
 TMP="$BASE/t/tmp/main"
-GIT_IMERGE="$BASE/git-imerge"
+GIT_IMERGE="git-imerge"
 
 cd "$TMP"
 
diff --git a/t/test-drop b/t/test-drop
index cef07b3..bc9caa7 100755
--- a/t/test-drop
+++ b/t/test-drop
@@ -15,7 +15,7 @@ modify() {
 
 BASE="$(dirname "$(cd $(dirname "$0") && pwd)")"
 TMP="$BASE/t/tmp/drop"
-GIT_IMERGE="$BASE/git-imerge"
+GIT_IMERGE="git-imerge"
 
 rm -rf "$TMP"
 mkdir -p "$TMP"
diff --git a/t/test-unconflicted b/t/test-unconflicted
index e89ed5a..23b4bd3 100755
--- a/t/test-unconflicted
+++ b/t/test-unconflicted
@@ -7,7 +7,7 @@ set -x
 
 BASE="$(dirname "$(cd $(dirname "$0") && pwd)")"
 TMP="$BASE/t/tmp/main"
-GIT_IMERGE="$BASE/git-imerge"
+GIT_IMERGE="git-imerge"
 
 cd "$TMP"
 
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..b1a54cb
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,9 @@
+[tox]
+envlist = py
+
+[testenv]
+commands =
+    /bin/sh t/create-test-repo
+    /bin/sh t/test-unconflicted
+    /bin/sh t/test-conflicted
+    /bin/sh t/test-drop