Building gstreamer from source in windows using cerbero .... issues with building gst-libav-1.0

[new baby]

Hi experts,

I am first time compiling gstreamer from source code and I am facing
difficulty in building gst-libav-1.0 in windows.

I followed link given in the gstreamer website. only creation of
.cerbero.cbc is avoided (as it gives lots more problems ,but default will
work it say in site)
https://gstreamer.freedesktop.org/documentation/installing/building-from-source-using-cerbero.html

 ISSUES

1) After running build command I am getting error of "*/w32pthreads.h:137:1:
error: unknown type name 'INIT_ONCE'"*  
For more detailed error see error.txt file
C:\\Users\\Admin\\AppData\\Local\\Programs\\Python\\Python36\\Python.exe
./cerbero-uninstalled buildone gst-libav-1.0 


2) when I set the enable nvenc , cuda ...etc its showing :
configure: WAARNING: unrecognized options: --enable-hwaccels
--enable-devices --enable-nvenc --enable-omx   --enable-omx-rpi
--enable-cuda --enable-cuvid   --enable-libnpp  --enable-ffmpeg

I have added above option in file "gst-libav-1.0.recipe" at below mentioned
place 

class Recipe(custom.GStreamer):
    name = 'gst-libav-1.0'
    # TODO - check license - plugin is certainly LGPLv2+, but need to check
    #        the linked libs
    licenses = [License.LGPLv2Plus]
    config_sh = 'sh ./autogen.sh --noconfigure && ./configure'
    configure_options = "--enable-lgpl --disable-examples --enable-static "
  
How can I enable this option in the build of libav ?

Note:
I have added logs generated while building "Python.exe ./cerbero-uninstalled 
buildone gst-libav-1.0 / Python.exe ./cerbero-uninstalled  build
gst-libav-1.0 "

a) gst-libav-1.0-compile.log
gst-libav-1.log
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/gst-libav-1.log>  
b) gst-libav-1.0-configure.log
gst-libav-1.log
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/gst-libav-1.log>  
c) gst-libav-1.0-fetch.log
gst-libav-1.log
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/gst-libav-1.log>  
d) error.txt
error.txt
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/error.txt>  


Kindly help me in the above issues.
Thanks in advance .





gst-libav-1.log
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/gst-libav-1.log>  
gst-libav-1.log
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/gst-libav-1.log>  
gst-libav-1.log
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/gst-libav-1.log>  
error.txt
<http://gstreamer-devel.966125.n4.nabble.com/file/t378175/error.txt>  



-----
adi
--
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