https://bugs.gentoo.org/943781
--- a/ttyrec.c
+++ b/ttyrec.c
@@ -122,14 +122,12 @@ int	aflg;
 int	uflg;
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	extern int optind;
 	int ch;
 	void finish();
-	char *getenv();
+	char *getenv(const char *);
 	char *command = NULL;
 
 	while ((ch = getopt(argc, argv, "aue:h?")) != EOF)
diff --git a/ttyrec.c b/ttyrec.c
index b112dc6..ab78ce3 100644
--- a/ttyrec.c
+++ b/ttyrec.c
@@ -126,7 +126,7 @@ main(int argc, char *argv[])
 {
 	extern int optind;
 	int ch;
-	void finish();
+	void finish(int);
 	char *getenv(const char *);
 	char *command = NULL;
 
@@ -207,7 +207,7 @@ doinput()
 #include <sys/wait.h>
 
 void
-finish()
+finish(int sig)
 {
 #if defined(SVR4)
 	int status;