Adopting change by @jblespiau

python_configure.bzl

diff --git a/python_configure.bzl b/python_configure.bzl
index 1f5bffa..bb505c7 100644
--- a/python_configure.bzl
+++ b/python_configure.bzl
@@ -246,6 +246,9 @@
 
 def _get_python_include(repository_ctx, python_bin):
     """Gets the python include path."""
+    python_lib = repository_ctx.os.environ.get(_PYTHON_LIB_PATH)
+    if python_lib != None:
+        return python_lib
     result = _execute(
         repository_ctx,
         [