[FFmpeg-user] a Compiling error of ffmpeg3.4.2 on win10(64) platform

[Davie Kim]

Hi, Dear FFMPEGer,

I try to compile ffmpeg 3.4.2 ( source code was git clone from repository of the latest version) on my PC of win10 ( 64bit ) 

Here is my compiling steps:
(1) install MinGW,  https://sourceforge.net/projects/mingw/files/latest/download?source=files
Installation location: c:/MinGW
I added 'call "location/vcvars64.bat" ' in 'msys.bat'
(2) install yasm ( win64.exe ),  http://yasm.tortall.net/Download.html
Copy it to folder 'c:/windows/system32'
(3) then 'git clone https://github.com/FFmpeg/FFmpeg.git' in Git Bash
(4) cd to ffmpeg, run './configure --disable-static --enable-shared -arch=x86_64'

It spit a WARNING: 'pkg-config not found, library detection may fail'
And I ignored it, and run 'make', but failed; ERROR messages:
./compat/w32pthreads.h:122:9: error: unknown type name 'INIT_ONCE'
 typedef INIT_ONCE pthread_once_t;
./compat/w32pthreads.h:131:5: error: implicit declaration of function 'InitOnceComplete'
libavdevice/alldevices.c: At top level:
./compat/w32pthreads.h:123:27: error: 'INIT_ONCE_STATIC_INIT' undeclared here (not in a function) 
 #define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
                           ^
./libavutil/thread.h:145:22: note: in expansion of macro 'PTHREAD_ONCE_INIT'
 #define AV_ONCE_INIT PTHREAD_ONCE_INIT
                      ^~~~~~~~~~~~~~~~~
libavdevice/alldevices.c:92:37: note: in expansion of macro 'AV_ONCE_INIT'
 static AVOnce av_device_next_init = AV_ONCE_INIT;