diff --git a/games/prboom/files/patch-src_SDL_i__system.c b/games/prboom/files/patch-src_SDL_i__system.c
new file mode 100644
index 000000000000..4ecd359deef2
--- /dev/null
+++ b/games/prboom/files/patch-src_SDL_i__system.c
@@ -0,0 +1,19 @@
+--- src/SDL/i_system.c.orig	2008-11-09 18:19:11 UTC
++++ src/SDL/i_system.c
+@@ -72,6 +72,7 @@
+ #include <fcntl.h>
+ #include <sys/stat.h>
+ #include <errno.h>
++#include <sys/cpuset.h>
+ 
+ #ifndef PRBOOM_SERVER
+ #include "m_argv.h"
+@@ -441,7 +442,7 @@ void I_SetAffinityMask(void)
+     // POSIX version:
+     int i;
+     {
+-      cpu_set_t set;
++      cpuset_t set;
+ 
+       CPU_ZERO(&set);
+