http://gentoo-overlays.zugaina.org/sabayon/portage/sys-apps/ddcxinfo-knoppix/files/ddcxinfo-knoppix-kernel-headers.patch
--- ./lrmi.c.orig	2008-12-15 15:27:02.000000000 +0000
+++ ./lrmi.c	2008-12-15 15:29:03.000000000 +0000
@@ -15,6 +15,16 @@ This software has NO WARRANTY.  Use it a
 #include <string.h>
 #include <sys/io.h>
 #include <asm/vm86.h>
+/* 2.6.26+ kernels don't define the legacy masks. */
+#if defined(__linux__) && !defined(TF_MASK)
+      #define TF_MASK X86_EFLAGS_TF
+      #define IF_MASK X86_EFLAGS_IF
+      #define NT_MASK X86_EFLAGS_NT
+      #define VIF_MASK X86_EFLAGS_VIF
+      #define VIP_MASK X86_EFLAGS_VIP
+      #define IOPL_MASK X86_EFLAGS_IOPL
+#endif
+
 
 #ifdef USE_LIBC_VM86
 #include <sys/vm86.h>