3 files changed, 5 insertions, 30 deletions
diff --git a/cryptography/hazmat/backends/__init__.py b/cryptography/hazmat/backends/__init__.py
index 663d1f55..b0f663fe 100644
--- a/cryptography/hazmat/backends/__init__.py
+++ b/cryptography/hazmat/backends/__init__.py
@@ -25,23 +25,12 @@ def _available_backends():
     global _available_backends_list
 
     if _available_backends_list is None:
-        _available_backends_list = []
-
-        for backend in pkg_resources.iter_entry_points(
-            "cryptography.hazmat.backends"
-        ):
-            is_backend_available = pkg_resources.get_entry_info(
-                backend.dist,
-                "cryptography.hazmat.is_backend_available",
-                backend.name
+        _available_backends_list = [
+            backend.load(require=False)
+            for backend in pkg_resources.iter_entry_points(
+                "cryptography.backends"
             )
-
-            if is_backend_available is not None:
-                is_backend_available = is_backend_available.load(require=False)
-                if not is_backend_available():
-                    continue
-
-            _available_backends_list.append(backend.load(require=False))
+        ]
 
     return _available_backends_list
 
diff --git a/cryptography/hazmat/bindings/commoncrypto/binding.py b/cryptography/hazmat/bindings/commoncrypto/binding.py
index ee7378ad..ee09bebd 100644
--- a/cryptography/hazmat/bindings/commoncrypto/binding.py
+++ b/cryptography/hazmat/bindings/commoncrypto/binding.py
@@ -13,9 +13,6 @@
 
 from __future__ import absolute_import, division, print_function
 
-import platform
-import sys
-
 from cryptography.hazmat.bindings.utils import build_ffi
 
 
@@ -53,8 +50,3 @@ class Binding(object):
             modules=cls._modules,
             extra_link_args=["-framework", "Security"]
         )
-
-    @classmethod
-    def is_available(cls):
-        return sys.platform == "darwin" and list(map(
-            int, platform.mac_ver()[0].split("."))) >= [10, 8, 0]
diff --git a/cryptography/hazmat/bindings/openssl/binding.py b/cryptography/hazmat/bindings/openssl/binding.py
index 4cbe3c5b..37891f6b 100644
--- a/cryptography/hazmat/bindings/openssl/binding.py
+++ b/cryptography/hazmat/bindings/openssl/binding.py
@@ -116,12 +116,6 @@ class Binding(object):
         assert res != 0
 
     @classmethod
-    def is_available(cls):
-        # For now, OpenSSL is considered our "default" binding, so we treat it
-        # as always available.
-        return True
-
-    @classmethod
     def init_static_locks(cls):
         with cls._lock_init_lock:
             cls._ensure_ffi_initialized()