Update __init__.py

#3188

Author: Sahil-pixel

pythonforandroid/recipes/pybind11/__init__.py

@@ -3,15 +3,31 @@
 
 
 class Pybind11Recipe(PythonRecipe):
+    """
+    Recipe to build pybind11 for Android using cmake.
+    """
 
-    version = '2.11.1'
-    url = 'https://github.com/pybind/pybind11/archive/refs/tags/v{version}.zip'
-    depends = ['setuptools']
+    version = "2.11.1"
+    url = "https://github.com/pybind/pybind11/archive/refs/tags/v{version}.zip"
+
+    # Make sure we depend on setuptools and cmake
+    depends = ["setuptools", "cmake"]
+    # Don’t let p4a try to run setup.py through targetpython
     call_hostpython_via_targetpython = False
+    # Install into hostpython, because pybind11 is a header-only lib
     install_in_hostpython = True
 
+    def get_recipe_env(self, arch):
+        env = super().get_recipe_env(arch)
+        # Ensure cmake is found inside hostpython
+        env["PATH"] = "/usr/bin:" + env.get("PATH", "")
+        return env
+
     def get_include_dir(self, arch):
-        return join(self.get_build_dir(arch.arch), 'include')
+        """
+        Return the directory where pybind11 headers will be located.
+        """
+        return join(self.get_build_dir(arch.arch), "include")
 
 
 recipe = Pybind11Recipe()