add pybind11 to setup-requires

pyproject.toml

@@ -5,7 +5,8 @@
 requires =[
         "setuptools >=39.2.0",
         "setuptools_scm >= 4.1.2",
-        "wheel >= 0.35.1" ]
+        "wheel >= 0.35.1",
+        "pybind11 >= 2.6.2" ]
 
 build-backend = "setuptools.build_meta"
 

setup.cfg

@@ -35,6 +35,8 @@ setup_requires =
     setuptools >=39.2.0
     setuptools_scm >= 4.1.2
     wheel >= 0.35.1
+    pybind11 >= 2.6.2
+
 [options.extras_require]
 # To install these dependencies, run pip install .[test]
 test =