See:
https://github.com/godotengine/godot/pull/110113

Index: modules/camera/config.py
--- modules/camera/config.py.orig
+++ modules/camera/config.py
@@ -1,7 +1,7 @@
 def can_build(env, platform):
     import sys
 
-    if sys.platform.startswith("freebsd"):
+    if sys.platform.startswith("freebsd") or sys.platform.startswith("openbsd"):
         return False
     return platform == "macos" or platform == "windows" or platform == "linuxbsd"
 
