Index: src/ctime.c
==================================================================
--- src/ctime.c
+++ src/ctime.c
@@ -153,10 +153,13 @@
   "MAX_MMAP_SIZE=" CTIMEOPT_VAL(SQLITE_MAX_MMAP_SIZE),
 #endif
 #ifdef SQLITE_MAX_SCHEMA_RETRY
   "MAX_SCHEMA_RETRY=" CTIMEOPT_VAL(SQLITE_MAX_SCHEMA_RETRY),
 #endif
+#ifdef SQLITE_MAX_WORKER_THREADS
+  "MAX_WORKER_THREADS=" CTIMEOPT_VAL(SQLITE_MAX_WORKER_THREADS),
+#endif
 #ifdef SQLITE_MEMDEBUG
   "MEMDEBUG",
 #endif
 #ifdef SQLITE_MIXED_ENDIAN_64BIT_FLOAT
   "MIXED_ENDIAN_64BIT_FLOAT",

Index: src/threads.c
==================================================================
--- src/threads.c
+++ src/threads.c
@@ -96,11 +96,12 @@
 #endif /* SQLITE_OS_UNIX && defined(SQLITE_MUTEX_PTHREADS) */
 /******************************** End Unix Pthreads *************************/
 
 
 /********************************* Win32 Threads ****************************/
-#if SQLITE_OS_WIN && !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && SQLITE_THREADSAFE>0
+#if SQLITE_OS_WIN && !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && \
+    SQLITE_THREADSAFE>0 && defined(_MSC_VER)
 
 #define SQLITE_THREADS_IMPLEMENTED 1  /* Prevent the single-thread code below */
 #include <process.h>
 
 /* A running thread */
@@ -189,11 +190,12 @@
   if( rc==WAIT_OBJECT_0 ) *ppOut = p->pResult;
   sqlite3_free(p);
   return (rc==WAIT_OBJECT_0) ? SQLITE_OK : SQLITE_ERROR;
 }
 
-#endif /* SQLITE_OS_WIN && !SQLITE_OS_WINCE && !SQLITE_OS_WINRT */
+#endif /* SQLITE_OS_WIN && !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && \
+          SQLITE_THREADSAFE>0 && defined(_MSC_VER) */
 /******************************** End Win32 Threads *************************/
 
 
 /********************************* Single-Threaded **************************/
 #ifndef SQLITE_THREADS_IMPLEMENTED