From: Chris Lamb <lamby@debian.org>
Subject: Support building under Linux 4.x (and beyond)

--- a/configure.in
+++ b/configure.in
@@ -712,17 +712,17 @@
           AC_MSG_NOTICE([Linux detected as host for PCI host device mapping])
           linux_version=`uname -r`
 	  case "$linux_version" in
+		2.2*)
+			AC_MSG_ERROR([Linux kernel 2.4, 2.6 or 3.x is required for PCI host device mapping])
+               ;;
 		2.4*)
 	  		PCIDEV_MODULE_MAKE_ALL="all-kernel24"
 			KERNEL_MODULE_SUFFIX="o"
           	;;
-		2.6*|3.*)
+		*)
 	  		PCIDEV_MODULE_MAKE_ALL="all-kernel26"
 			KERNEL_MODULE_SUFFIX="ko"
 		;;
-		*)
-			AC_MSG_ERROR([Linux kernel 2.4, 2.6 or 3.x is required for PCI host device mapping])
-		;;
 	  esac
 	  KERNELDIR="/lib/modules/$linux_version/build"
 	  LSMOD="lsmod"
