add option "build_context" in anticipation of AFP entries that require special tricks in Isabelle/ML (NB: system component settings are unavailable in AFP);
--- a/etc/options Wed Jul 19 11:31:19 2023 +0200
+++ b/etc/options Wed Jul 19 11:40:00 2023 +0200
@@ -183,6 +183,9 @@
section "Build Process"
+option build_context : string = ""
+ -- "free-form information for session build (to be interpreted in Isabelle/ML)"
+
option build_thorough : bool = false
-- "observe dependencies on options with tag 'content' or 'document'"