Can't build opencv : 'recursive_mutex' in namespace 'std' does not name a type

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I'm trying to build opencv using mingw gcc 9.2, and i got the following
message:

[  6%] Building CXX object
modules/core/CMakeFiles/opencv_core.dir/src/algorithm.cpp.obj
In file included from
F:\Temp\test\opencv-4.5.1\modules\core\src\precomp.hpp:49,
                 from
F:\Temp\test\opencv-4.5.1\modules\core\src\algorithm.cpp:43:
F:/Temp/test/opencv-4.5.1/modules/core/include/opencv2/core/utility.hpp:706:14:
error: 'recursive_mutex' in namespace 'std' does not name a type
  706 | typedef std::recursive_mutex Mutex;
      |              ^~~~~~~~~~~~~~~
F:/Temp/test/opencv-4.5.1/modules/core/include/opencv2/core/utility.hpp:63:1:
note: 'std::recursive_mutex' is defined in header '<mutex>'; did you forget
to '#include <mutex>'?

So what should I do to get it worked?

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<div dir=3D"ltr"><div>I&#39;m trying to build opencv using mingw gcc 9.2, a=
nd i got the following message:</div><div><br></div>[ =C2=A06%] Building CX=
X object modules/core/CMakeFiles/opencv_core.dir/src/algorithm.cpp.obj<br>I=
n file included from F:\Temp\test\opencv-4.5.1\modules\core\src\precomp.hpp=
:49,<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0from =
F:\Temp\test\opencv-4.5.1\modules\core\src\algorithm.cpp:43:<br>F:/Temp/tes=
t/opencv-4.5.1/modules/core/include/opencv2/core/utility.hpp:706:14: error:=
 &#39;recursive_mutex&#39; in namespace &#39;std&#39; does not name a type<=
br>=C2=A0 706 | typedef std::recursive_mutex Mutex;<br>=C2=A0 =C2=A0 =C2=A0=
 | =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0^~~~~~~~~~~~~~~<br>F:/Te=
mp/test/opencv-4.5.1/modules/core/include/opencv2/core/utility.hpp:63:1: no=
te: &#39;std::recursive_mutex&#39; is defined in header &#39;&lt;mutex&gt;&=
#39;; did you forget to &#39;#include &lt;mutex&gt;&#39;?<br><div><br></div=
><div>So what should I do to get it worked?</div></div>

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