diff --git a/cibuildwheel/__main__.py b/cibuildwheel/__main__.py
index 99fea065..7f040614 100644
--- a/cibuildwheel/__main__.py
+++ b/cibuildwheel/__main__.py
@@ -109,8 +109,6 @@ def main():
         project_setup_py = os.path.join(project_dir, 'setup.py')
         name_output = subprocess.check_output([sys.executable, project_setup_py, '--name'],
                                               universal_newlines=True)
-        # the last line of output is the name
-        package_name = name_output.strip().splitlines()[-1]
     except subprocess.CalledProcessError as err:
         if not os.path.exists(project_setup_py):
             print('cibuildwheel: Could not find setup.py at root of project', file=sys.stderr)
@@ -121,14 +119,8 @@ def main():
                   file=sys.stderr)
             exit(err.returncode)
 
-    if package_name == '' or package_name == 'UNKNOWN':
-        print('cibuildwheel: Invalid package name "%s". Check your setup.py' % package_name,
-              file=sys.stderr)
-        exit(2)
-
     build_options = dict(
         project_dir=project_dir,
-        package_name=package_name,
         output_dir=output_dir,
         test_command=test_command,
         test_requires=test_requires,
diff --git a/cibuildwheel/linux.py b/cibuildwheel/linux.py
index ee221443..c907c6b6 100644
--- a/cibuildwheel/linux.py
+++ b/cibuildwheel/linux.py
@@ -9,7 +9,7 @@ except ImportError:
     from pipes import quote as shlex_quote
 
 
-def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, build_selector, environment, manylinux1_images):
+def build(project_dir, output_dir, test_command, test_requires, before_build, build_verbosity, build_selector, environment, manylinux1_images):
     try:
         subprocess.check_call(['docker', '--version'])
     except:
@@ -102,7 +102,6 @@ def build(project_dir, package_name, output_dir, test_command, test_requires, be
                 chown {uid}:{gid} "/output/$(basename "$delocated_wheel")"
             done
         '''.format(
-            package_name=package_name,
             pybin_paths=' '.join(c.path+'/bin' for c in platform_configs),
             test_requires=' '.join(test_requires),
             test_command=shlex_quote(
diff --git a/cibuildwheel/macos.py b/cibuildwheel/macos.py
index 906da91a..ccdd3780 100644
--- a/cibuildwheel/macos.py
+++ b/cibuildwheel/macos.py
@@ -10,7 +10,7 @@ except ImportError:
 from .util import prepare_command, get_build_verbosity_extra_flags
 
 
-def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, build_selector, environment):
+def build(project_dir, output_dir, test_command, test_requires, before_build, build_verbosity, build_selector, environment):
     PythonConfiguration = namedtuple('PythonConfiguration', ['version', 'identifier', 'url'])
     python_configurations = [
         PythonConfiguration(version='2.7', identifier='cp27-macosx_10_6_intel', url='https://www.python.org/ftp/python/2.7.15/python-2.7.15-macosx10.6.pkg'),
diff --git a/cibuildwheel/windows.py b/cibuildwheel/windows.py
index 51d428ce..f5a4ffb8 100644
--- a/cibuildwheel/windows.py
+++ b/cibuildwheel/windows.py
@@ -10,7 +10,7 @@ from glob import glob
 from .util import prepare_command, get_build_verbosity_extra_flags
 
 
-def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, build_selector, environment):
+def build(project_dir, output_dir, test_command, test_requires, before_build, build_verbosity, build_selector, environment):
     # run_with_env is a cmd file that sets the right environment variables to
     run_with_env = os.path.join(tempfile.gettempdir(), 'appveyor_run_with_env.cmd')
     if not os.path.exists(run_with_env):