Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -53,6 +53,7 @@ from _common import MACOS  # NOQA
 from _common import NETBSD  # NOQA
 from _common import OPENBSD  # NOQA
 from _common import POSIX  # NOQA
+from _common import SECBSD  # NOQA
 from _common import SUNOS  # NOQA
 from _common import WINDOWS  # NOQA
 from _common import hilite  # NOQA
@@ -289,7 +290,7 @@ elif FREEBSD:
         # fmt: on
     )
 
-elif OPENBSD:
+elif OPENBSD or SECBSD:
     macros.append(("PSUTIL_OPENBSD", 1))
     ext = Extension(
         'psutil._psutil_bsd',
@@ -552,7 +553,7 @@ def main():
                     missdeps("pkg install gcc python%s" % py3)
                 elif which('mport'):  # MidnightBSD
                     missdeps("mport install gcc python%s" % py3)
-            elif OPENBSD:
+            elif OPENBSD or SECBSD:
                 missdeps("pkg_add -v gcc python%s" % py3)
             elif NETBSD:
                 missdeps("pkgin install gcc python%s" % py3)