Do never install from wheels

src/zc/buildout/easy_install.py

@@ -39,6 +39,8 @@ import tempfile
 import zc.buildout
 import warnings
 
+WHL_DIST = pkg_resources.EGG_DIST + 1
+
 warnings.filterwarnings(
     'ignore', '.+is being parsed as a legacy, non PEP 440, version')
 
@@ -545,7 +547,7 @@ class Installer:
         # Filter the available dists for the requirement and source flag
         dists = [dist for dist in index[requirement.project_name]
                  if ((dist in requirement)
-                     and
+                     and dist.precedence != WHL_DIST and
                      ((not source) or
                       (dist.precedence == pkg_resources.SOURCE_DIST)
                       )