Explicit dependency on setuptools (pkg_resources).

acme/setup.py

@@ -16,6 +16,7 @@ install_requires = [
     'pyrfc3339',
     'pytz',
     'requests',
+    'setuptools',  # pkg_resources
     'six',
     'werkzeug',
 ]

letsencrypt-apache/setup.py

@@ -7,6 +7,7 @@ install_requires = [
     'letsencrypt',
     'mock<1.1.0',  # py26
     'python-augeas',
+    'setuptools',  # pkg_resources
     'zope.component',
     'zope.interface',
 ]

letsencrypt-nginx/setup.py

@@ -8,6 +8,7 @@ install_requires = [
     'mock<1.1.0',  # py26
     'PyOpenSSL',
     'pyparsing>=1.5.5',  # Python3 support; perhaps unnecessary?
+    'setuptools',  # pkg_resources
     'zope.interface',
 ]
 

letshelp-letsencrypt/setup.py

@@ -4,7 +4,9 @@ from setuptools import setup
 from setuptools import find_packages
 
 
-install_requires = []
+install_requires = [
+    'setuptools',  # pkg_resources
+]
 if sys.version_info < (2, 7):
     install_requires.append("mock<1.1.0")
 else:

setup.py

@@ -42,6 +42,7 @@ install_requires = [
     'python2-pythondialog>=3.2.2rc1',  # Debian squeeze support, cf. #280
     'pytz',
     'requests',
+    'setuptools',
     'zope.component',
     'zope.interface',
 ]