Index: pyproject.toml
--- pyproject.toml.orig
+++ pyproject.toml
@@ -27,6 +27,7 @@ exclude_lines = [
     "if MACOS",
     "if NETBSD",
     "if OPENBSD",
+    "if SECBSD",
     "if ppid_map is None:",
     "if PY3:",
     "if SUNOS",