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This patch fix error on 'gnulib' library required to build
'grep' package on GNU/Hurd.
The patch was adapted from upstream source repository:
'<http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commit;h=4084b3a1094372b960ce4a97634e08f4538c8bdd>'
Commit: 4084b3a1094372b960ce4a97634e08f4538c8bdd
diff --git a/lib/glthread/lock.c b/lib/glthread/lock.c
index 061562b..afc86f4 100644
--- a/lib/glthread/lock.c
+++ b/lib/glthread/lock.c
@@ -30,7 +30,7 @@
/* ------------------------- gl_rwlock_t datatype ------------------------- */
-# if HAVE_PTHREAD_RWLOCK && (HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER || (__GNU_LIBRARY__ > 1))
+# if HAVE_PTHREAD_RWLOCK && (HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER || (defined PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP && (__GNU_LIBRARY__ > 1)))
# ifdef PTHREAD_RWLOCK_INITIALIZER
diff --git a/lib/glthread/lock.h b/lib/glthread/lock.h
index ec16d39..67932aa 100644
--- a/lib/glthread/lock.h
+++ b/lib/glthread/lock.h
@@ -179,7 +179,7 @@ typedef pthread_mutex_t gl_lock_t;
/* ------------------------- gl_rwlock_t datatype ------------------------- */
-# if HAVE_PTHREAD_RWLOCK && (HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER || (__GNU_LIBRARY__ > 1))
+# if HAVE_PTHREAD_RWLOCK && (HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER || (defined PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP && (__GNU_LIBRARY__ > 1)))
# ifdef PTHREAD_RWLOCK_INITIALIZER
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