--- trousers-0.3.11.2/src/include/tcsd.h.orig
+++ trousers-0.3.11.2/src/include/tcsd.h
@@ -167,7 +167,7 @@
 void	   thread_signal_init();
 
 /* signal handling */
-struct sigaction tcsd_sa_int;
-struct sigaction tcsd_sa_chld;
+extern struct sigaction tcsd_sa_int;
+extern struct sigaction tcsd_sa_chld;
 
 #endif