Argh. Security doesn't need a special export target. It gets built with the rest of SeaMonkey.

client.mak

@@ -407,8 +407,6 @@ install:
 export:
 	@cd $(MOZ_SRC)\$(MOZ_TOP)\nsprpub
 	gmake -f gmakefile.win MOZ_SRC_FLIPPED=$(MOZ_SRC_FLIPPED)
-	@cd $(MOZ_SRC)\$(MOZ_TOP)\security
-	nmake -f makefile.win export
 	@cd $(MOZ_SRC)\$(MOZ_TOP)\.
 	set DIST_DIRS=1
 	set LAYOUT_DIRS=1