fixed compilation errors

src/Makefile

@@ -1,5 +1,5 @@
 OBJS=main.o sysinput.o log.o gpio.o msg_queue.o time_func.o
-LIBS=
+LIBS=-lpthread
 
 upiwin: $(OBJS)
 	gcc -o upiwin $(OBJS) $(LIBS)

src/msg.h

@@ -5,7 +5,7 @@
 
 #define MSG_ATTRCOUNT 2
 
-typedef tagMSG {
+typedef struct tagMSG {
   uintptr_t target;
   unsigned message;
   uintptr_t attrs[MSG_ATTRCOUNT];

src/msg_queue.c

@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <string.h>
 #include <pthread.h>
 #include "wintype.h"
 #include "time_func.h"
@@ -12,8 +13,8 @@ PMSG_QUEUE MqAlloc(int nentries)
   rc = (PMSG_QUEUE)malloc(sz);
   if (!rc)
     return NULL;
-  memset(rc, 0 sz);
-  rc->startbound = &(rc->messagestore);
+  memset(rc, 0, sz);
+  rc->startbound = &(rc->messagestore[0]);
   rc->endbound = rc->startbound + nentries;
   rc->head = rc->tail = rc->startbound;
   rc->nentries = nentries;

src/sysinput.c

@@ -22,13 +22,13 @@ static void *input_thread(void *arg)
     st = Gpio_read_buttons();
     if (st != last_bstate)
     {
-      tmp = last_state & ~st;
+      tmp = last_bstate & ~st;
       for (attr = 1, mask = 1; attr <= 4; attr++, mask <<= 1)
       {
 	if (tmp & mask)
 	  MqPost1(Sys_Queue, 0, WM_HWBUTTONUP, attr);
       }
-      tmp = st & ~last_state;
+      tmp = st & ~last_bstate;
       for (attr = 1, mask = 1; attr <= 4; attr++, mask <<= 1)
       {
 	if (tmp & mask)