bug#11456: guile-2.0.5 fails to compile under mingw+msys

[gnuemacser]

Hello,
I got the sources of guile-2.0.5 and I tried to compile them under 
mingw+msys.
The compilation failed because of this error:

make[3]: Entering directory `/e/temp/files/1/guile/guile-2.0.5/libguile'
  CC     libguile_2.0_la-threads.lo
threads.c: In function 'to_timespec':
threads.c:267:15: error: dereferencing pointer to incomplete type
threads.c:268:15: error: dereferencing pointer to incomplete type
threads.c:275:15: error: dereferencing pointer to incomplete type
threads.c:276:15: error: dereferencing pointer to incomplete type
threads.c: In function 'launch_thread':
threads.c:1012:3: warning: implicit declaration of function 'GC_pthread_detach'
[-Wimplicit-function-declaration]
threads.c: In function 'scm_call_with_new_thread':
threads.c:1048:3: warning: implicit declaration of function 'GC_pthread_create'
[-Wimplicit-function-declaration]
threads.c: In function 'scm_join_thread_timed':
threads.c:1229:18: error: storage size of 'ctimeout' isn't known
threads.c:1229:18: warning: unused variable 'ctimeout' [-Wunused-variable]
threads.c: In function 'fat_mutex_lock':
threads.c:1453:41: error: dereferencing pointer to incomplete type
threads.c:1454:36: error: dereferencing pointer to incomplete type
threads.c:1455:43: error: dereferencing pointer to incomplete type
threads.c: In function 'scm_lock_mutex_timed':
threads.c:1487:18: error: storage size of 'cwaittime' isn't known
threads.c:1487:18: warning: unused variable 'cwaittime' [-Wunused-variable]
threads.c: In function 'scm_try_mutex':
threads.c:1536:18: error: storage size of 'cwaittime' isn't known
threads.c:1536:18: warning: unused variable 'cwaittime' [-Wunused-variable]
threads.c: In function 'fat_mutex_unlock':
threads.c:1610:4: warning: passing argument 4 of 'block_self' discards 'const' qualifier from pointer target type [enabled by default]
threads.c:438:1: note: expected 'struct scm_t_timespec *' but argument is of type 'const struct scm_t_timespec *'
threads.c: In function 'scm_unlock_mutex_timed':
threads.c:1679:18: error: storage size of 'cwaittime' isn't known
threads.c:1679:18: warning: unused variable 'cwaittime' [-Wunused-variable]
threads.c: In function 'scm_timed_wait_condition_variable':
threads.c:1783:18: error: storage size of 'waittime' isn't known
threads.c:1783:18: warning: unused variable 'waittime' [-Wunused-variable]
threads.c: In function 'scm_pthread_cond_timedwait':
threads.c:1984:3: warning: passing argument 3 of 'pthread_cond_timedwait' from incompatible pointer type [enabled by default]
d:\dev\mingw\include/pthread.h:1097:31: note: expected 'const struct timespec *' but argument is of type 'const struct scm_t_timespec *'
make[3]: *** [libguile_2.0_la-threads.lo] Error 1
make[3]: Leaving directory `/e/temp/files/1/guile/guile-2.0.5/libguile'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/e/temp/files/1/guile/guile-2.0.5/libguile'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/e/temp/files/1/guile/guile-2.0.5'
make: *** [all] Error 2

i'm chinese and my english isn't well. but i think the problem is about the timespec and scm_t_timespec in function pthread_cond_timedwait .