https://bugs.gentoo.org/870871
--- a/src/interface_ncurses.c
+++ b/src/interface_ncurses.c
@@ -41,3 +41,3 @@
  * characters */
-static nr_print_ull(char *c, int max_chars, unsigned long long l)
+static int nr_print_ull(char *c, int max_chars, unsigned long long l)
 {