--- /dev/null
+--- a/Makefile
++++ b/Makefile
+@@ -155,13 +155,15 @@ unload:
+ configcheck:
+ @echo -n "Checking kernel configuration... "
+
+- @# check version of kernel
+- @echo $(KERNELRELEASE) | grep -q -i '^[2-9]\.[4-9]\.' || { \
+- echo "FAILED"; \
+- echo "Only kernel versions 2.4.x and above are supported."; \
+- echo "You have $(KERNELRELEASE)."; \
+- exit 1; \
+- }
++ @# check kernel version
++ @case $(KERNELRELEASE) in \
++ 2.[456].*) ;; \
++ [3-9].*) ;; \
++ *) echo "FAILED"; \
++ echo "Only kernel versions 2.4.x and above are supported."; \
++ echo "You have $(KERNELRELEASE)."; \
++ exit 1 ;; \
++ esac
+
+ @# check kernel configuration
+ @if [ -z "$(CONFIG_SYSCTL)" ]; then \