diff --git a/closed/OpenJ9.gmk b/closed/OpenJ9.gmk
index 611b8013df3..83dce8d3b46 100644
--- a/closed/OpenJ9.gmk
+++ b/closed/OpenJ9.gmk
@@ -170,6 +170,13 @@ else # OPENJ9_ENABLE_OPENJDK_METHODHANDLES
   FEATURE_SED_SCRIPT += $(call SedDisable,opt_openjdkMethodhandle)
 endif # OPENJ9_ENABLE_OPENJDK_METHODHANDLES
 
+# Adjust MicroJIT enablement flags.
+ifeq (true,$(OPENJ9_ENABLE_MICROJIT))
+  FEATURE_SED_SCRIPT += $(call SedEnable,opt_microjit)
+else
+  FEATURE_SED_SCRIPT += $(call SedDisable,opt_microjit)
+endif # OPENJ9_ENABLE_MICROJIT
+
 # openj9_stage_buildspec_file
 # ---------------------------
 # param 1 = The simple name of the file to copy.
@@ -346,6 +353,12 @@ else # OPENJ9_ENABLE_OPENJDK_METHODHANDLES
   CMAKE_ARGS += -DJ9VM_OPT_OPENJDK_METHODHANDLE=OFF
 endif # OPENJ9_ENABLE_OPENJDK_METHODHANDLES
 
+ifeq (true,$(OPENJ9_ENABLE_MICROJIT))
+  CMAKE_ARGS += -DJ9VM_OPT_MICROJIT=ON
+else
+  CMAKE_ARGS += -DJ9VM_OPT_MICROJIT=OFF
+endif # OPENJ9_ENABLE_MICROJIT
+
 ifneq (,$(filter debug trace, $(LOG_LEVEL)))
   # The user said LOG=debug or LOG=trace, so tell cmake to echo commands.
   CMAKE_ARGS += -DCMAKE_VERBOSE_MAKEFILE=ON
@@ -389,6 +402,10 @@ ifeq (true,$(OPENJ9_ENABLE_JITSERVER))
   endif
 endif # OPENJ9_ENABLE_JITSERVER
 
+ifeq (true,$(OPENJ9_ENABLE_MICROJIT))
+  CUSTOM_COMPILER_ENV_VARS += J9VM_OPT_MICROJIT=1
+endif # OPENJ9_ENABLE_MICROJIT
+
 run-preprocessors-j9 : stage-j9
 	@$(ECHO) Running OpenJ9 preprocessors with OPENJ9_BUILDSPEC: $(OPENJ9_BUILDSPEC)
 	@$(MKDIR) -p $(J9TOOLS_DIR)
diff --git a/common/autoconf/generated-configure.sh b/common/autoconf/generated-configure.sh
index 263d37f2a0b..e925b9c2012 100644
--- a/common/autoconf/generated-configure.sh
+++ b/common/autoconf/generated-configure.sh
@@ -4433,7 +4433,7 @@ VS_SDK_PLATFORM_NAME_2017=
 #CUSTOM_AUTOCONF_INCLUDE
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1649701470
+DATE_WHEN_GENERATED=1652392606
 
 ###############################################################################
 #
diff --git a/jdk/make/closed/autoconf/custom-hook.m4 b/jdk/make/closed/autoconf/custom-hook.m4
index 4b901355a18..5bfba5722f1 100644
--- a/jdk/make/closed/autoconf/custom-hook.m4
+++ b/jdk/make/closed/autoconf/custom-hook.m4
@@ -48,6 +48,7 @@ AC_DEFUN_ONCE([CUSTOM_EARLY_HOOK],
   OPENJ9_CONFIGURE_JITSERVER
   OPENJ9_CONFIGURE_OPENJDK_METHODHANDLES
   OPENJ9_CONFIGURE_WARNINGS
+  OPENJ9_CONFIGURE_MICROJIT
 
   if test "x$OPENJDK_TARGET_OS" = xwindows ; then
     BASIC_SETUP_OUTPUT_DIR
@@ -384,6 +385,31 @@ AC_DEFUN([OPENJ9_CONFIGURE_WARNINGS],
   AC_SUBST(WARNINGS_AS_ERRORS_OPENJ9)
 ])
 
+AC_DEFUN([OPENJ9_CONFIGURE_MICROJIT],
+[
+  AC_ARG_ENABLE([microjit], [AS_HELP_STRING([--enable-microjit], [enable MicroJIT support @<:@disabled@:>@])])
+
+  AC_MSG_CHECKING([for microjit])
+  OPENJ9_ENABLE_MICROJIT=false
+  if test "x$enable_microjit" = xyes ; then
+    if test "x$OPENJDK_TARGET_OS" = xlinux ; then
+      AC_MSG_RESULT([yes (explicitly enabled)])
+      OPENJ9_ENABLE_MICROJIT=true
+    else
+      AC_MSG_RESULT([no (unsupported platform)])
+      AC_MSG_ERROR([MicroJIT is unsupported for $OPENJDK_TARGET_OS])
+    fi
+  elif test "x$enable_microjit" = xno ; then
+    AC_MSG_RESULT([no (explicitly disabled)])
+  elif test "x$enable_microjit" = x ; then
+    AC_MSG_RESULT([no (default)])
+  else
+    AC_MSG_ERROR([--enable-microjit accepts no argument])
+  fi
+
+  AC_SUBST(OPENJ9_ENABLE_MICROJIT)
+])
+
 AC_DEFUN([OPENJ9_PLATFORM_SETUP],
 [
   AC_ARG_WITH(noncompressedrefs, [AS_HELP_STRING([--with-noncompressedrefs],
diff --git a/jdk/make/closed/autoconf/custom-spec.gmk.in b/jdk/make/closed/autoconf/custom-spec.gmk.in
index 74166c6a3ea..322d8cb8495 100644
--- a/jdk/make/closed/autoconf/custom-spec.gmk.in
+++ b/jdk/make/closed/autoconf/custom-spec.gmk.in
@@ -62,6 +62,9 @@ OPENJ9_ENABLE_INLINE_TYPES          := @OPENJ9_ENABLE_INLINE_TYPES@
 OPENJ9_ENABLE_JITSERVER             := @OPENJ9_ENABLE_JITSERVER@
 OPENJ9_ENABLE_OPENJDK_METHODHANDLES := @OPENJ9_ENABLE_OPENJDK_METHODHANDLES@
 
+# MICROJIT
+OPENJ9_ENABLE_MICROJIT := @OPENJ9_ENABLE_MICROJIT@
+
 # for constructing version output
 COMPILER_VERSION_STRING := @COMPILER_VERSION_STRING@
 USERNAME                := @USERNAME@
diff --git a/jdk/make/closed/autoconf/generated-configure.sh b/jdk/make/closed/autoconf/generated-configure.sh
index 54277eed70f..fc937d6b0de 100644
--- a/jdk/make/closed/autoconf/generated-configure.sh
+++ b/jdk/make/closed/autoconf/generated-configure.sh
@@ -895,6 +895,7 @@ CYGWIN_LINK
 OUTPUT_ROOT
 CONF_NAME
 SPEC
+OPENJ9_ENABLE_MICROJIT
 WARNINGS_AS_ERRORS_OPENJ9
 WARNINGS_AS_ERRORS_OMR
 OPENJ9_ENABLE_OPENJDK_METHODHANDLES
@@ -1103,6 +1104,7 @@ enable_jitserver
 enable_openjdk_methodhandles
 enable_warnings_as_errors_omr
 enable_warnings_as_errors_openj9
+enable_microjit
 with_conf_name
 with_toolchain_version
 with_freemarker_jar
@@ -1937,6 +1939,7 @@ Optional Features:
   --disable-warnings-as-errors-openj9
                           do not consider OpenJ9 native compile warnings to be
                           errors [enabled]
+  --enable-microjit       enable MicroJIT support [disabled]
   --disable-headful       disable building headful support (graphical UI
                           support) [enabled]
   --enable-hotspot-test-in-build
@@ -4591,6 +4594,8 @@ VS_SDK_PLATFORM_NAME_2017=
 
 
 
+
+
 
 
 
@@ -4604,7 +4609,7 @@ VS_SDK_PLATFORM_NAME_2017=
 
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1649701470
+DATE_WHEN_GENERATED=1652392606
 
 ###############################################################################
 #
@@ -16478,6 +16483,38 @@ $as_echo "yes (default)" >&6; }
 
 
 
+  # Check whether --enable-microjit was given.
+if test "${enable_microjit+set}" = set; then :
+  enableval=$enable_microjit;
+fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for microjit" >&5
+$as_echo_n "checking for microjit... " >&6; }
+  OPENJ9_ENABLE_MICROJIT=false
+  if test "x$enable_microjit" = xyes ; then
+    if test "x$OPENJDK_TARGET_OS" = xlinux ; then
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes (explicitly enabled)" >&5
+$as_echo "yes (explicitly enabled)" >&6; }
+      OPENJ9_ENABLE_MICROJIT=true
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: no (unsupported platform)" >&5
+$as_echo "no (unsupported platform)" >&6; }
+      as_fn_error $? "MicroJIT is unsupported for $OPENJDK_TARGET_OS" "$LINENO" 5
+    fi
+  elif test "x$enable_microjit" = xno ; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no (explicitly disabled)" >&5
+$as_echo "no (explicitly disabled)" >&6; }
+  elif test "x$enable_microjit" = x ; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no (default)" >&5
+$as_echo "no (default)" >&6; }
+  else
+    as_fn_error $? "--enable-microjit accepts no argument" "$LINENO" 5
+  fi
+
+
+
+
   if test "x$OPENJDK_TARGET_OS" = xwindows ; then