diff --git a/linuxdoom-1.10/i_sound.c b/linuxdoom-1.10/i_sound.c
index a327bfa29..ee18e19c6 100644
--- a/linuxdoom-1.10/i_sound.c
+++ b/linuxdoom-1.10/i_sound.c
@@ -24,6 +24,7 @@
 static const char
 rcsid[] = "$Id: i_unix.c,v 1.5 1997/02/03 22:45:10 b1 Exp $";
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -163,7 +164,6 @@ myioctl
   int*	arg )
 {   
     int		rc;
-    extern int	errno;
     
     rc = ioctl(fd, command, arg);  
     if (rc < 0)
diff --git a/linuxdoom-1.10/i_video.c b/linuxdoom-1.10/i_video.c
index 9b311b39a..2b07fa2aa 100644
--- a/linuxdoom-1.10/i_video.c
+++ b/linuxdoom-1.10/i_video.c
@@ -46,7 +46,7 @@ int XShmGetEventBase( Display* dpy ); // problems with g++?
 #include <sys/socket.h>
 
 #include <netinet/in.h>
-#include <errnos.h>
+#include <errno.h>
 #include <signal.h>
 
 #include "doomstat.h"
@@ -768,7 +768,7 @@ void I_InitGraphics(void)
 
     // use the default visual 
     X_screen = DefaultScreen(X_display);
-    if (!XMatchVisualInfo(X_display, X_screen, 8, PseudoColor, &X_visualinfo))
+    if (!XMatchVisualInfo(X_display, X_screen, 4, PseudoColor, &X_visualinfo))
 	I_Error("xdoom currently only supports 256-color PseudoColor screens");
     X_visual = X_visualinfo.visual;