diff --git a/setup.py b/setup.py
index bba4bce..609481c 100644
--- a/setup.py
+++ b/setup.py
@@ -48,10 +48,7 @@ if [int(i) for i in setuptools_version.split('.')] < [3, 3]:
 try:
     subprocess.check_call(['pkg-config', '--version'])
 except OSError:
-    raise SystemExit(
-        "'pkg-config' is required to install this package. "
-        "Please see the README for details."
-    )
+    pass
 
 
 def download_library(command):
diff --git a/setup_support.py b/setup_support.py
index 68a2a7f..ccbafac 100644
--- a/setup_support.py
+++ b/setup_support.py
@@ -40,6 +40,7 @@ def absolute(*paths):
 
 def build_flags(library, type_, path):
     """Return separated build flags from pkg-config output"""
+    return []
 
     pkg_config_path = [path]
     if "PKG_CONFIG_PATH" in os.environ: