Patch to make aafire from aalib to stablize frame rate

fix-aafire-aalib-gentoo.patch

--- a/src/aafire.c
+++ b/src/aafire.c
@@ -2,4 +2,5 @@
 #include <stdlib.h> /* exit() */
+#include <time.h>
 #include "aalib.h"

 #define XSIZ aa_imgwidth(context)
@@ -135,14 +136,29 @@ drawfire (void)
                    aa_scrheight (context));
   aa_flush (context);
 }
+#define DESIRED_FPS 5
+#define MS_DELAY (1000 / DESIRED_FPS)
+#define MAX_NS 1000000000
+
+static struct timespec
+add_ms (struct timespec base, int ms)
+{
+  long nsec = base.tv_nsec + (long)(100000 * ms);
+  return (struct timespec){ .tv_nsec = (nsec >= MAX_NS) ? nsec - MAX_NS : nsec, .tv_sec = (nsec >= MAX_NS) ? base.tv_sec + 1 : base.tv_sec };
+}
+
 static void
 game (void)
 {
   int event;
+  struct timespec cur, next;
   gentable ();
   while (!(event = aa_getevent (context, 0)) || event == AA_RESIZE)
     {
+      clock_gettime (CLOCK_MONOTONIC, &cur);
       drawfire ();
+      next = add_ms (cur, MS_DELAY);
+      clock_nanosleep (CLOCK_MONOTONIC, TIMER_ABSTIME, &next, NULL);
     }
 }
 int