diff --git a/newlib/libc/sys/rtems/crt0.c b/newlib/libc/sys/rtems/crt0.c
index a6f48f295..8d87fd4cf 100644
--- a/newlib/libc/sys/rtems/crt0.c
+++ b/newlib/libc/sys/rtems/crt0.c
@@ -15,6 +15,7 @@
 #include <signal.h> /* sigset_t */
 #include <time.h> /* struct timespec */
 #include <unistd.h> /* isatty */
+#include <sys/lock.h> /* _Mutex_recursive_Control */
 
 void rtems_provides_crt0( void ) {}  /* dummy symbol so file always has one */
 
@@ -27,7 +28,37 @@ RTEMS_STUB(void *,malloc(size_t s), { return 0; })
 RTEMS_STUB(void *,realloc(void* p, size_t s), { return 0; })
 RTEMS_STUB(void, free(void* ptr), { })
 RTEMS_STUB(_PTR, calloc(size_t s1, size_t s2), { return 0; })
+RTEMS_STUB(int, posix_memalign(void **p, size_t si, size_t s2), { return -1; })
 
+/* Stubs for routines from RTEMS <sys/lock.h> */
+RTEMS_STUB(void, _Mutex_Acquire(struct _Mutex_Control *p), { })
+RTEMS_STUB(int,  _Mutex_Acquire_timed(struct _Mutex_Control *p1, const struct timespec *p2), { return -1; })
+RTEMS_STUB(int,  _Mutex_Try_Acquire(struct _Mutex_Control *p), { return -1; })
+RTEMS_STUB(void, _Mutex_Release(struct _Mutex_Control *p), { })
+
+RTEMS_STUB(void, _Mutex_recursive_Acquire(struct _Mutex_recursive_Control *p), { })
+RTEMS_STUB(int,  _Mutex_recursive_Acquire_timed(struct _Mutex_recursive_Control *p1, const struct timespec *p2), { return -1; })
+RTEMS_STUB(int,  _Mutex_recursive_Try_acquire(struct _Mutex_recursive_Control *p), { return -1; })
+RTEMS_STUB(void, _Mutex_recursive_Release(struct _Mutex_recursive_Control *p), { })
+
+RTEMS_STUB(void, _Condition_Wait(struct _Condition_Control *p1, struct _Mutex_Control *p2), { })
+RTEMS_STUB(int,  _Condition_Wait_timed(struct _Condition_Control *p1, struct _Mutex_Control *p2, const struct timespec *p3), { return -1; })
+RTEMS_STUB(void, _Condition_Wait_recursive(struct _Condition_Control *p1, struct _Mutex_recursive_Control *p2), { })
+RTEMS_STUB(int,  _Condition_Wait_recursive_timed(struct _Condition_Control *p1, struct _Mutex_recursive_Control *p2, const struct timespec *p3), { return -1; })
+RTEMS_STUB(void, _Condition_Signal(struct _Condition_Control *p), { })
+RTEMS_STUB(void, _Condition_Broadcast(struct _Condition_Control *p), { })
+
+RTEMS_STUB(void, _Semaphore_Wait(struct _Semaphore_Control *p), { })
+RTEMS_STUB(void, _Semaphore_Post(struct _Semaphore_Control *p), { })
+
+RTEMS_STUB(int, _Futex_Wait(struct _Futex_Control *p1, int *p2, int i), { return -1; })
+RTEMS_STUB(int, _Futex_Wake(struct _Futex_Control *p, int i), { return -1; })
+
+RTEMS_STUB(int, _Sched_Count(void), { return -1; })
+RTEMS_STUB(int, _Sched_Index(void), { return -1; })
+RTEMS_STUB(int, _Sched_Name_to_index(const char *p, size_t s), { return -1; })
+RTEMS_STUB(int, _Sched_Processor_count(int i), { return 1; })
+ 
 #if defined(__GNUC__)
 /*
  * stubs for libstdc++ rtems-threads support functions from gcc/gthr-rtems.h