Pass system flag to pyhon which

pipenv/project.py

@@ -1155,12 +1155,11 @@ class Project:
                 result = str(result.path)
         return result
 
-    @property
-    def python(self) -> str:
+    def python(self, system=False) -> str:
         """Path to the project python"""
         from pipenv.utils.shell import project_python
 
-        return project_python(self)
+        return project_python(self, system=system)
 
     def _which(self, command, location=None, allow_global=False):
         if not allow_global and location is None:

pipenv/utils/project.py

@@ -79,4 +79,4 @@ def ensure_project(
         skip_requirements=skip_requirements,
         system=system,
     )
-    os.environ["PIP_PYTHON_PATH"] = project.python
+    os.environ["PIP_PYTHON_PATH"] = project.python(system=system)

pipenv/utils/resolver.py

@@ -1166,7 +1166,7 @@ def resolve_deps(
     req_dir = req_dir if req_dir else os.environ.get("req_dir", None)
     if not req_dir:
         req_dir = create_tracked_tempdir(prefix="pipenv-", suffix="-requirements")
-    with HackedPythonVersion(python_path=project.python):
+    with HackedPythonVersion(python_path=project.python(system=allow_global)):
         try:
             results, hashes, markers_lookup, resolver, skipped = actually_resolve_deps(
                 deps,
@@ -1185,7 +1185,7 @@ def resolve_deps(
     # Second (last-resort) attempt:
     if results is None:
         with HackedPythonVersion(
-            python_path=project.python,
+            python_path=project.python(system=allow_global),
         ):
             try:
                 # Attempt to resolve again, with different Python version information,