diff --git a/iscsi-scst/Makefile b/iscsi-scst/Makefile
index aa1c03584..52d9410c0 100644
--- a/iscsi-scst/Makefile
+++ b/iscsi-scst/Makefile
@@ -81,7 +81,9 @@ ifeq ($(OFED_FLAVOR),MOFED)
 	OFED_DIR:=/usr/src/ofa_kernel/default
 	OFED_CFLAGS:=	-I$(OFED_DIR)/include				\
 			-I$(OFED_DIR)/include/uapi			\
-			-include $(OFED_DIR)/include/linux/compat-2.6.h
+			-include $(OFED_DIR)/include/linux/compat-2.6.h \
+			-DMOFED_MAJOR=$(shell echo $(OFED_VERS) | cut -f1 -d.)\
+			-DMOFED_MINOR=$(shell echo $(OFED_VERS) | cut -f2 -d.)
 	ISER_SYMVERS:="$(ISER_SYMVERS) $(OFED_DIR)/$(MODULE_SYMVERS)"
 	OFED_CONFIG:= CONFIG_DTRACE=
 else
diff --git a/scripts/specialize-patch b/scripts/specialize-patch
index 19fb9d933..9c59e1bf3 100755
--- a/scripts/specialize-patch
+++ b/scripts/specialize-patch
@@ -197,6 +197,22 @@ function evaluate(stmnt, pattern, arg, op, result) {
                    "(\\1) * 256 + (\\2)", "g", stmnt)
   }
 
+  if (MOFED_MAJOR == "") {
+    gsub("defined\\(MOFED_MAJOR\\)", "0", stmnt)
+    gsub("MOFED_MAJOR", "", stmnt)
+  } else {
+    gsub("defined\\(MOFED_MAJOR\\)", "1", stmnt)
+    gsub("MOFED_MAJOR", MOFED_MAJOR, stmnt)
+  }
+
+  if (MOFED_MINOR == "") {
+    gsub("defined\\(MOFED_MINOR\\)", "0", stmnt)
+    gsub("MOFED_MINOR", "", stmnt)
+  } else {
+    gsub("defined\\(MOFED_MINOR\\)", "1", stmnt)
+    gsub("MOFED_MINOR", MOFED_MINOR, stmnt)
+  }
+
   gsub("defined\\(UEK_KABI_RENAME\\)", "0", stmnt)
 
   if (SCSI_EXEC_REQ_FIFO_DEFINED != "")
@@ -384,6 +400,8 @@ function handle_if(evaluated)
       || $0 ~ "IB_QUERY_GID_HAS_ATTR_ARG" \
       || $0 ~ "INSIDE_KERNEL_TREE" \
       || $0 ~ "MAD_HANDLER_TAKES_SEND_BUF" \
+      || $0 ~ "MOFED_MAJOR"        \
+      || $0 ~ "MOFED_MINOR"        \
       || $0 ~ "RDMA_CREATE_ID_TAKES_NET_ARG" \
       || $0 ~ "REGISTER_MAD_AGENT_HAS_FLAGS_ARG" \
       || $0 ~ "RHEL_MAJOR"         \
diff --git a/scst/include/backport.h b/scst/include/backport.h
index 3ebdf5770..853faf8ea 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -905,7 +905,9 @@ static inline void *kvzalloc(size_t size, gfp_t flags)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0) &&			\
+       (!defined(MOFED_MAJOR) || !defined(MOFED_MINOR) ||		\
+	MOFED_MAJOR < 4 || (MOFED_MAJOR == 4 && MOFED_MINOR < 5))
 /* See also commit 1c542f38ab8d ("mm: Introduce kvcalloc()") # v4.18. */
 static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
 {
diff --git a/srpt/Makefile b/srpt/Makefile
index 159a15577..d262a64dc 100644
--- a/srpt/Makefile
+++ b/srpt/Makefile
@@ -67,6 +67,8 @@ OFED_VERS=$(OFED_RPM_VERS)$(OFED_DEB_VERS)
 OFED_CFLAGS:=-I$(OFED_KERNEL_DIR)/include      \
              -I$(OFED_KERNEL_DIR)/include/uapi \
              -include "linux/compat-2.6.h"
+OFED_CFLAGS+=-DMOFED_MAJOR=$(shell echo "$(OFED_VERS)" | sed 's/\([0-9]\+\)[^0-9]\+\([0-9]\+\).*/\1/g')
+OFED_CFLAGS+=-DMOFED_MINOR=$(shell echo "$(OFED_VERS)" | sed 's/\([0-9]\+\)[^0-9]\+\([0-9]\+\).*/\2/g')
 else
 # OFED 1.5
 OFED_KERNEL_DIR:=/usr/src/ofa_kernel