After variable expansion, what was formerly a single word can now

contain multiple words, all of which may have to be joined with the
path of the extension directory.
(Sjoerd)

Tools/freeze/checkextensions.py

@@ -44,6 +44,7 @@ def select(e, mods, vars, mod, skipofiles):
 		if not w:
 			continue
 		w = expandvars(w, vars)
+		for w in string.split(w):
 			if skipofiles and w[-2:] == '.o':
 				continue
 			if w[0] != '-' and w[-2:] in ('.o', '.a'):