3 files changed, 30 insertions, 0 deletions
diff --git a/numpy/_build_utils/README b/numpy/_build_utils/README
new file mode 100644
index 000000000..73d93593e
--- /dev/null
+++ b/numpy/_build_utils/README
@@ -0,0 +1,9 @@
+=======
+WARNING
+=======
+
+This directory (numpy/_build_utils) is *not* part of the public numpy API,
+ - it is internal build support for numpy.
+ - it is only present in source distributions or during an in place build
+ - it is *not* installed with the rest of numpy
+
diff --git a/numpy/_build_utils/__init__.py b/numpy/_build_utils/__init__.py
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/numpy/_build_utils/__init__.py
diff --git a/numpy/_build_utils/apple_accelerate.py b/numpy/_build_utils/apple_accelerate.py
new file mode 100644
index 000000000..8ce54619e
--- /dev/null
+++ b/numpy/_build_utils/apple_accelerate.py
@@ -0,0 +1,21 @@
+import os
+import sys
+import re
+
+__all__ = ['uses_accelerate_framework']
+
+def uses_accelerate_framework(info):
+    """ Returns True if Accelerate framework is used for BLAS/LAPACK """
+    # If we're not building on Darwin (macOS), don't use Accelerate
+    if sys.platform != "darwin":
+        return False
+    # If we're building on macOS, but targeting a different platform,
+    # don't use Accelerate.
+    if os.getenv('_PYTHON_HOST_PLATFORM', None):
+        return False
+    r_accelerate = re.compile("Accelerate")
+    extra_link_args = info.get('extra_link_args', '')
+    for arg in extra_link_args:
+        if r_accelerate.search(arg):
+            return True
+    return False