diff --git a/configure b/configure
index c71348be55..7d0a3b099e 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 242885 .
+# From configure.ac Revision: 242972 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61 for asterisk 1.6.
 #
@@ -17555,6 +17555,66 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
 
+# Can we compare a mutex to its initial value?
+# Generally yes on OpenBSD/FreeBSD and no on Mac OS X.
+{ echo "$as_me:$LINENO: checking whether we can compare a mutex to its initial value" >&5
+echo $ECHO_N "checking whether we can compare a mutex to its initial value... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <pthread.h>
+int
+main ()
+{
+pthread_mutex_t lock;
+	if ((lock) != ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
+		return 0;
+	}
+	return 0
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  { echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define CAN_COMPARE_MUTEX_TO_INIT_VALUE 1
+_ACEOF
+
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	{ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+
 #if test "${cross_compiling}" = "no";
 #then
 #AC_MSG_CHECKING(for working epoll support)
diff --git a/configure.ac b/configure.ac
index 0d16a86a75..fd21ce602d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -544,6 +544,20 @@ fi
 
 AST_C_DEFINE_CHECK([PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP], [PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP], [pthread.h])
 
+# Can we compare a mutex to its initial value?
+# Generally yes on OpenBSD/FreeBSD and no on Mac OS X.
+AC_MSG_CHECKING(whether we can compare a mutex to its initial value)
+AC_LINK_IFELSE(
+	AC_LANG_PROGRAM([#include <pthread.h>], [pthread_mutex_t lock;
+	if ((lock) != ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
+		return 0;
+	}
+	return 0]),
+	AC_MSG_RESULT(yes)
+	AC_DEFINE([CAN_COMPARE_MUTEX_TO_INIT_VALUE], 1, [Define to 1 if your system's implementation of mutexes supports comparison of a mutex to its initializer.]),
+	AC_MSG_RESULT(no)
+)
+
 #if test "${cross_compiling}" = "no";
 #then
 #AC_MSG_CHECKING(for working epoll support)
diff --git a/include/asterisk/autoconfig.h.in b/include/asterisk/autoconfig.h.in
index ee05b88368..f6c65b34a3 100644
--- a/include/asterisk/autoconfig.h.in
+++ b/include/asterisk/autoconfig.h.in
@@ -10,6 +10,10 @@
 /* Define to 1 if internal poll should be used. */
 #undef AST_POLL_COMPAT
 
+/* Define to 1 if your system's implementation of mutexes supports comparison
+   of a mutex to its initializer. */
+#undef CAN_COMPARE_MUTEX_TO_INIT_VALUE
+
 /* Define to 1 if the `closedir' function returns void instead of `int'. */
 #undef CLOSEDIR_VOID
 
diff --git a/include/asterisk/lock.h b/include/asterisk/lock.h
index cc71322e32..99a5517dc3 100644
--- a/include/asterisk/lock.h
+++ b/include/asterisk/lock.h
@@ -80,7 +80,7 @@
 #define AST_PTHREADT_NULL (pthread_t) -1
 #define AST_PTHREADT_STOP (pthread_t) -2
 
-#if (defined(SOLARIS) || defined(BSD)) && !defined(__Darwin__)
+#if (defined(SOLARIS) || defined(BSD))
 #define AST_MUTEX_INIT_W_CONSTRUCTORS
 #endif /* SOLARIS || BSD */
 
@@ -283,7 +283,7 @@ static inline int __ast_pthread_mutex_init(int track, const char *filename, int
 	int res;
 	pthread_mutexattr_t  attr;
 
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 
 	if ((t->mutex) != ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
 /*
@@ -319,7 +319,7 @@ static inline int __ast_pthread_mutex_destroy(const char *filename, int lineno,
 	int res;
 	int canlog = strcmp(filename, "logger.c") & t->track;
 
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
 		/* Don't try to uninitialize non initialized mutex
 		 * This may no effect on linux
@@ -373,7 +373,7 @@ static inline int __ast_pthread_mutex_lock(const char *filename, int lineno, con
 	int res;
 	int canlog = strcmp(filename, "logger.c") & t->track;
 
-#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS)
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
 		/* Don't warn abount uninitialized mutex.
 		 * Simple try to initialize it.
@@ -461,7 +461,7 @@ static inline int __ast_pthread_mutex_trylock(const char *filename, int lineno,
 	int res;
 	int canlog = strcmp(filename, "logger.c") & t->track;
 
-#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS)
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
 		/* Don't warn abount uninitialized mutex.
 		 * Simple try to initialize it.
@@ -507,7 +507,7 @@ static inline int __ast_pthread_mutex_unlock(const char *filename, int lineno, c
 	int res;
 	int canlog = strcmp(filename, "logger.c") & t->track;
 
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
 		__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
 				   filename, lineno, func, mutex_name);
@@ -586,7 +586,7 @@ static inline int __ast_cond_wait(const char *filename, int lineno, const char *
 	int res;
 	int canlog = strcmp(filename, "logger.c") & t->track;
 
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
 		__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
 				   filename, lineno, func, mutex_name);
@@ -657,7 +657,7 @@ static inline int __ast_cond_timedwait(const char *filename, int lineno, const c
 	int res;
 	int canlog = strcmp(filename, "logger.c") & t->track;
 
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	if ((t->mutex) == ((pthread_mutex_t) PTHREAD_MUTEX_INITIALIZER)) {
 		__ast_mutex_logger("%s line %d (%s): Error: mutex '%s' is uninitialized.\n",
 				   filename, lineno, func, mutex_name);
@@ -893,8 +893,8 @@ static inline int __ast_rwlock_init(const char *filename, int lineno, const char
 {
 	int res;
 	pthread_rwlockattr_t attr;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
-        int canlog = strcmp(filename, "logger.c");
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
+	int canlog = strcmp(filename, "logger.c");
 
         if (*prwlock != ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
 		__ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is already initialized.\n",
@@ -919,7 +919,7 @@ static inline int __ast_rwlock_destroy(const char *filename, int lineno, const c
 	int res;
 	int canlog = strcmp(filename, "logger.c");
 
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	if (*prwlock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
 		__ast_mutex_logger("%s line %d (%s): Warning: rwlock '%s' is uninitialized.\n",
 				   filename, lineno, func, rwlock_name);
@@ -939,7 +939,7 @@ static inline int _ast_rwlock_unlock(ast_rwlock_t *lock, const char *name,
 	const char *file, int line, const char *func)
 {
 	int res;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	int canlog = strcmp(file, "logger.c");
 
 	if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
@@ -964,7 +964,7 @@ static inline int _ast_rwlock_rdlock(ast_rwlock_t *lock, const char *name,
 	const char *file, int line, const char *func)
 {
 	int res;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	int canlog = strcmp(file, "logger.c");
 	
 	if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
@@ -995,7 +995,7 @@ static inline int _ast_rwlock_wrlock(ast_rwlock_t *lock, const char *name,
 	const char *file, int line, const char *func)
 {
 	int res;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	int canlog = strcmp(file, "logger.c");
 	
 	if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
@@ -1025,7 +1025,7 @@ static inline int _ast_rwlock_timedrdlock(ast_rwlock_t *lock, const char *name,
 	struct timespec *abs_timeout, const char *file, int line, const char *func)
 {
 	int res;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	int canlog = strcmp(file, "logger.c");
 
 	if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
@@ -1071,7 +1071,7 @@ static inline int _ast_rwlock_timedwrlock(ast_rwlock_t *lock, const char *name,
 	struct timespec *abs_timeout, const char *file, int line, const char *func)
 {
 	int res;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	int canlog = strcmp(file, "logger.c");
 
 	if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
@@ -1117,7 +1117,7 @@ static inline int _ast_rwlock_tryrdlock(ast_rwlock_t *lock, const char *name,
 	const char *file, int line, const char *func)
 {
 	int res;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	int canlog = strcmp(file, "logger.c");
 	
 	if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {
@@ -1148,7 +1148,7 @@ static inline int _ast_rwlock_trywrlock(ast_rwlock_t *lock, const char *name,
 	const char *file, int line, const char *func)
 {
 	int res;
-#ifdef AST_MUTEX_INIT_W_CONSTRUCTORS
+#if defined(AST_MUTEX_INIT_W_CONSTRUCTORS) && defined(CAN_COMPARE_MUTEX_TO_INIT_VALUE)
 	int canlog = strcmp(file, "logger.c");
 	
 	if (*lock == ((ast_rwlock_t) AST_RWLOCK_INIT_VALUE)) {