diff -ur invaders/clean.sh invaders-fixed/clean.sh
--- invaders/clean.sh	2001-05-21 22:43:13.000000000 +0200
+++ invaders-fixed/clean.sh	2009-04-13 17:03:14.000000000 +0200
@@ -2,4 +2,4 @@
 
 set -e
 set -v
-rm -f *.o *~ invaders.exec
+rm -f *.o *~ invaders.exec invaders
diff -ur invaders/compile.sh invaders-fixed/compile.sh
--- invaders/compile.sh	2001-05-21 22:26:46.000000000 +0200
+++ invaders-fixed/compile.sh	2009-04-13 16:59:44.000000000 +0200
@@ -4,7 +4,7 @@
 set -v
 
 CFLAGS="-fno-builtin -nostdinc -O2 -I. -Wall -Werror"
-LDFLAGS="-nostdlib -Wl,-N -Wl,-Ttext -Wl,100000"
+LDFLAGS="-nostdlib -Wl,-N -Wl,-Ttext -Wl,100000 -Wl,--build-id=none"
 gcc $CFLAGS -c keyboard.c
 gcc $CFLAGS -c delay.c
 gcc $CFLAGS -c common.c
diff -ur invaders/video.c invaders-fixed/video.c
--- invaders/video.c	2001-05-13 15:56:33.000000000 +0200
+++ invaders-fixed/video.c	2009-04-13 17:01:22.000000000 +0200
@@ -36,7 +36,7 @@
   video_putchar(x+1,y,hextab[hex&15]);
 };
 
-void video_putstring(int32 x, int32 y, uint8 *str)
+void video_putstring(int32 x, int32 y, char *str)
 {
   while (*str) video_putchar(x++,y,*(str++));
 };
diff -ur invaders/video.h invaders-fixed/video.h
--- invaders/video.h	2001-05-13 15:56:33.000000000 +0200
+++ invaders-fixed/video.h	2009-04-13 17:01:05.000000000 +0200
@@ -8,7 +8,7 @@
 void video_putchar(int32 x, int32 y, uint8 code);
 void video_fill(int32 x, int32 y, int32 width, int32 height, uint8 code);
 void video_puthex8(int32 x, int32 y, uint8 hex);
-void video_putstring(int32 x, int32 y, uint8 *str);
+void video_putstring(int32 x, int32 y, char *str);
 
 // immediate effect
 void video_update();
