Retrieved from: https://src.fedoraproject.org/rpms/esound/raw/rawhide/f/esound-c99.patch

Declare clean_exit to avoid an implicit function declaration and
future build breakage.  This style of declarations outside of header
files is already used for other functions.

diff --git a/clients.c b/clients.c
index 1f7e4aa644bdc32c..14416e620dcccbbf 100644
--- a/clients.c
+++ b/clients.c
@@ -33,7 +33,7 @@ static int write_wait = 0;
 /* prototypes */
 void dump_clients(void);
 void free_client( esd_client_t *client );
-
+void clean_exit(int signum);
 
 /*******************************************************************/
 /* for debugging purposes, dump the list of the clients and data */