Use virtualenv for all builds and install everything from wheelhouse

Use venv for all builds and install everything from wheelhouse

Use venv and all minimum requirements

Edit requirements.txt in place and use one call

Update minimum versions and install exclusively from wheelhouse

Use mpl 1.3.1 on py 3.2

Fix pip invocation

Fix pip invocation again

Another fix to pip invocation

Explicitly use venv python to call build_versions.py

Move venv creation and activation to top level

Do not use site-packages

Fix minimum matplotlib ver and Pillow version check

Fix minimum matplotlib ver

Improve error message on version check

Add more debug info

Even more debug info

More debug info

Yet another debug print

Fix python 2.7 installation problem

check for PIL.Image version on install

Add debug to before_install

Try a pip install virtualenv first

Clean up virtualenv creation, add debug info, fix PySide script install

Fix virtualenv path for PySide install

Fix venv location and activation

Try no site packages and fix python 2.7 install

setup.py

@@ -35,7 +35,7 @@ DEPENDENCIES = {}
 with open('requirements.txt', 'rb') as fid:
     data = fid.read().decode('utf-8', 'replace')
 for line in data.splitlines():
-    pkg, _, version_info = line.partition('>=')
+    pkg, _, version_info = line.replace('==', '>=').partition('>=')
     # Only require Cython if we have a developer checkout
     if pkg.lower() == 'cython' and not VERSION.endswith('dev'):
         continue
@@ -88,22 +88,29 @@ def check_requirements():
     for (package_name, min_version) in DEPENDENCIES.items():
         if package_name == 'cython':
             package_name = 'Cython'
-        dep_error = False
+        dep_error = ''
         if package_name.lower() == 'pillow':
             package_name = 'PIL.Image'
+            min_version = '1.1.7'
         try:
             package = __import__(package_name,
                 fromlist=[package_name.rpartition('.')[0]])
         except ImportError:
-            dep_error = True
+            dep_error = ('You need `%s` version %s or later.'
+                         % (package_name, min_version))
         else:
-            package_version = get_package_version(package)
+            if package_name == 'PIL':
+                package_version = package.PILLOW_VERSION
+            else:
+                package_version = get_package_version(package)
 
             if LooseVersion(min_version) > LooseVersion(package_version):
-                dep_error = True
+                dep_error = ('You need `%s` version %s or later,'
+                             'found version %s.'
+                             % (package_name, min_version,
+                                package_version))
         if dep_error:
-            raise ImportError('You need `%s` version %s or later.' \
-                              % (package_name, min_version))
+            raise ImportError(dep_error)
 
 
 if __name__ == "__main__":