+## IMPORTANT for headless build
+# to enable `gradle jalviewjs` headless build you MUST set
+# j2s.config.altfileproperty = org.jalview.jalviewjsj2sfilename
+# (or set to whatever value jalviewjs_j2s_alt_file_property is set to)
+# in your ./.j2s file
+# OR run the task `gradle jalviewjsEnableAltFileProperty` to do that for you (before headless build task)
+jalviewjs_j2s_alt_file_property = org.jalview.jalviewjsj2sfilename
+jalviewjs_j2s_alt_settings = build/jalviewjs/config/j2s
+
+# these are used for actual .j2s file to pass on to alt j2s file
+jalviewjs_j2s_settings = .j2s
+jalviewjs_j2s_alt_file_property_config = j2s.config.altfileproperty
+