build: removed old check for libknot 2.3.0

The 2.4.0 is required as a minimum.

diff --git a/Makefile b/Makefile
index 3af15b389e423ec1d1032778ead99d2f34adc2c4..d0381193afa871b0670a7ad530d6653b9985c89b 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -171,9 +171,8 @@ ifneq (,$(findstring luajit, $(lua_LIBS)))
 endif
 endif
 
-# Check if it has libknot 2.3.0 and nettle to support DNS cookies
-$(eval $(call find_alt,knot230,libknot,2.3))
-ifeq ($(HAS_nettle)|$(HAS_knot230),yes|yes)
+# Check if it has nettle to support DNS cookies
+ifeq ($(HAS_nettle), yes)
 BUILD_CFLAGS += -DENABLE_COOKIES
 ENABLE_COOKIES := yes
 endif