diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 00000000..7f32b7e3
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,32 @@
+stages:
+  - host_test
+
+image: ${CI_DOCKER_REGISTRY}/esp32-ci-env
+
+variables:
+# tag in lwip-contrib repo, which supports our esp-lwip branch (and it's cherry-picked commits from release branches)
+  LWIP_CONTRIB_TAG: STABLE-2_0_1_RELEASE
+# test timeout is seconds
+  TEST_TIMEOUT: 200
+
+before_script:
+  # Use CI Tools
+  - curl -sSL ${CIT_LOADER_URL} | sh
+  - source citools/import_functions
+
+run_lwip_unittests:
+  stage: host_test
+  tags:
+    - host_test
+  dependencies: []
+  script:
+    # have to clone lwip-contrib repo, as it contains unit test infrastructure
+    - cit_add_ssh_key "${GITLAB_KEY}" "$(cit_parse_url_host ${LWIP_CONTRIB_MIRROR})" "$(cit_parse_url_port ${LWIP_CONTRIB_MIRROR})"
+    - git clone "${LWIP_CONTRIB_MIRROR}" lwip-contrib && cd lwip-contrib && git checkout tags/${LWIP_CONTRIB_TAG}
+    - cd ports/unix/check/
+    # updating environment
+    - export LWIPDIR=../../../../src && export CK_DEFAULT_TIMEOUT=${TEST_TIMEOUT}
+    - export TESTFILES=`find $LWIPDIR/../test/unit -name '*.c' | tr '\n' ' '`
+    - export CFLAGS=-I$LWIPDIR/../test/unit/esp
+    # build and run tests
+    - make "TESTFILES=$TESTFILES" check
diff --git a/src/core/tcp.c b/src/core/tcp.c
index 312e37bc..a49d9e08 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -1569,7 +1569,7 @@ typedef struct {
     u8_t total;
 }tcp_pcb_num_t;
 
-void tcp_pcb_num_cal(tcp_pcb_num_t *tcp_pcb_num)
+static void tcp_pcb_num_cal(tcp_pcb_num_t *tcp_pcb_num)
 {
     struct tcp_pcb_listen *listen;
     struct tcp_pcb *pcb;
diff --git a/test/unit/esp/arch/cc.h b/test/unit/esp/arch/cc.h
new file mode 100644
index 00000000..4cc3ff33
--- /dev/null
+++ b/test/unit/esp/arch/cc.h
@@ -0,0 +1,24 @@
+/*
+Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#ifndef _ESP_LWIP_ARCH_CC_H
+#define _ESP_LWIP_ARCH_CC_H
+
+typedef unsigned long   mem_ptr_t;
+
+#include "ports/unix/port/include/arch/cc.h"
+
+#endif /* _ESP_LWIP_ARCH_CC_H */
\ No newline at end of file
diff --git a/test/unit/esp/lwipopts.h b/test/unit/esp/lwipopts.h
new file mode 100644
index 00000000..fe7525f5
--- /dev/null
+++ b/test/unit/esp/lwipopts.h
@@ -0,0 +1,31 @@
+/*
+Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+#ifndef _ESP_LWIP_HDR_LWIPOPTS_H
+#define _ESP_LWIP_HDR_LWIPOPTS_H
+
+/* esp-lwip branch src and tests compilable */
+#define SNTP_SERVER_DNS                 0
+#define LWIP_HAVE_LOOPIF                1
+
+/* ESP specific cofiguration */
+#define ESP_LWIP                        1
+#define ESP_STATS_DROP                  0
+#define ESP_DHCP                        0
+#define ESP_STATS_TCP                   0
+
+#include "../lwipopts.h"
+
+#endif /* _ESP_LWIP_HDR_LWIPOPTS_H */