I haven’t built master for some time, so this is a bit late.
To build on FreeBSD I need to add the following change, I don’t expect that would cause any issues on other platforms.
+++ b/source/creator/symbols_unix.map
@@ -39,6 +39,9 @@ global:
realpath;
sched_*;
valloc;
+ /* needed on FreeBSD */
+ __progname;
+ environ;
local:
*;
};