opus.m4: fix -Wstrict-prototypes

Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Mark Harris <mark.hsj@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/opus.m4 b/opus.m4
index 47f5ec49..263470d4 100644
--- a/opus.m4
+++ b/opus.m4
@@ -63,7 +63,7 @@ dnl
 #include <string.h>
 #include <opus.h>
 
-int main ()
+int main (void)
 {
   system("touch conf.opustest");
   return 0;