Added the (possibly modified) Espressif SDK to the project to avoid problems with building. This may not be OK license wise, but who cares

esp_iot_sdk_v1.5.2/examples/wps/user/Makefile

@@ -0,0 +1,45 @@
+
+#############################################################
+# Required variables for each makefile
+# Discard this section from all parent makefiles
+# Expected variables (with automatic defaults):
+#   CSRCS (all "C" files in the dir)
+#   SUBDIRS (all subdirs with a Makefile)
+#   GEN_LIBS - list of libs to be generated ()
+#   GEN_IMAGES - list of images to be generated ()
+#   COMPONENTS_xxx - a list of libs/objs in the form
+#     subdir/lib to be extracted and rolled up into
+#     a generated lib/image xxx.a ()
+#
+ifndef PDIR
+GEN_LIBS = libuser.a
+endif
+
+
+#############################################################
+# Configuration i.e. compile options etc.
+# Target specific stuff (defines etc.) goes in here!
+# Generally values applying to a tree are captured in the
+#   makefile at its root level - these are then overridden
+#   for a subtree within the makefile rooted therein
+#
+#DEFINES += 
+
+#############################################################
+# Recursion Magic - Don't touch this!!
+#
+# Each subtree potentially has an include directory
+#   corresponding to the common APIs applicable to modules
+#   rooted at that subtree. Accordingly, the INCLUDE PATH
+#   of a module can only contain the include directories up
+#   its parent path, and not its siblings
+#
+# Required for each makefile to inherit from the parent
+#
+
+INCLUDES := $(INCLUDES) -I $(PDIR)include
+INCLUDES += -I ./
+INCLUDES += -I ../../include/ets
+PDIR := ../$(PDIR)
+sinclude $(PDIR)Makefile
+

esp_iot_sdk_v1.5.2/examples/wps/user/user_main.c

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+/******************************************************************************
+ * Copyright 2013-2014 Espressif Systems (Wuxi)
+ *
+ * FileName: user_main.c
+ *
+ * Description: entry file of user application
+ *
+ * Modification history:
+ *     2015/7/3, v1.0 create this file.
+*******************************************************************************/
+
+#include "osapi.h"
+#include "user_interface.h"
+
+#include "driver/key.h"
+
+#define WPS_KEY_NUM        1
+
+#define WPS_KEY_IO_MUX     PERIPHS_IO_MUX_MTCK_U
+#define WPS_KEY_IO_NUM     13
+#define WPS_KEY_IO_FUNC    FUNC_GPIO13
+
+LOCAL struct keys_param keys;
+LOCAL struct single_key_param *single_key;
+
+LOCAL void ICACHE_FLASH_ATTR
+user_wps_status_cb(int status)
+{
+	switch (status) {
+		case WPS_CB_ST_SUCCESS:
+			wifi_wps_disable();
+			wifi_station_connect();
+			break;
+		case WPS_CB_ST_FAILED:
+		case WPS_CB_ST_TIMEOUT:
+			wifi_wps_start();
+			break;
+	}
+}
+
+LOCAL void ICACHE_FLASH_ATTR
+user_wps_key_short_press(void)
+{
+	wifi_wps_disable();
+	wifi_wps_enable(WPS_TYPE_PBC);
+	wifi_set_wps_cb(user_wps_status_cb);
+	wifi_wps_start();
+}
+
+void ICACHE_FLASH_ATTR
+user_rf_pre_init(void)
+{
+}
+
+void ICACHE_FLASH_ATTR
+user_init(void)
+{
+	single_key = key_init_single(WPS_KEY_IO_NUM, WPS_KEY_IO_MUX, WPS_KEY_IO_FUNC,
+		                                    NULL, user_wps_key_short_press);
+
+	keys.key_num = WPS_KEY_NUM;
+	keys.single_key = &single_key;
+
+	key_init(&keys);
+
+	wifi_set_opmode(STATION_MODE);
+}