+H := \#
+IMB_HDR = $(shell echo '$Hinclude <intel-ipsec-mb.h>' | \
+ $(CC) -E $(EXTRA_CFLAGS) - | grep 'intel-ipsec-mb.h' | \
+ head -n1 | cut -d'"' -f2)
+
+# Detect library version
+IMB_VERSION = $(shell grep -e "IMB_VERSION_STR" $(IMB_HDR) | cut -d'"' -f2)
+IMB_VERSION_NUM = $(shell grep -e "IMB_VERSION_NUM" $(IMB_HDR) | cut -d' ' -f3)
+
+ifeq ($(IMB_VERSION),)
+$(error "IPSec_MB version >= 0.52 is required")
+endif
+
+ifeq ($(shell expr $(IMB_VERSION_NUM) \< 0x3400), 1)
+$(error "IPSec_MB version >= 0.52 is required")
+endif
+