You seem to be missing use Socket; in your script:

$ perl -e 'use strict; setsockopt(S, SOL_SOCKET, SO_BROADCAST, 1);'
Bareword "SOL_SOCKET" not allowed while "strict subs" in use at -e lin
+e 1.
Bareword "SO_BROADCAST" not allowed while "strict subs" in use at -e l
+ine 1.
Execution of -e aborted due to compilation errors.
$ perl -e 'use strict; use Socket; setsockopt(S, SOL_SOCKET, SO_BROADC
+AST, 1);'
$
[download]

setsockopt might be in section 3 or section 3SOCKET of the man pages. I'd be gobsmacked if your 'powers that be' had removed all man pages from all your (development) systems for space reasons.