diff --git a/source/gib_modules.c b/source/gib_modules.c
index a25e4fd..d6b5221 100644
--- a/source/gib_modules.c
+++ b/source/gib_modules.c
@@ -4,6 +4,8 @@
 
 #include <string.h>
 #include <ctype.h>
+#include <stdlib.h>
+
 #include "cvar.h"
 #include "console.h"
 #include "qargs.h"
diff --git a/source/vid_svgalib.c b/source/vid_svgalib.c
index 915dd1f..92db3ec 100644
--- a/source/vid_svgalib.c
+++ b/source/vid_svgalib.c
@@ -704,3 +704,8 @@ void VID_InitCvars ()
 void VID_SetCaption (char *text)
 {
 }
+
+void outb(unsigned char value, unsigned short port)
+{
+	__asm__ __volatile__ ("outb %b0,%w1" : : "a" (value) , "Nd" (port));
+}