folly errors when wdt is being built with cygwin64 on windows

[foroughmajidi]

I generated makefiles of wdt as following:
cmake -DGFLAGS_INCLUDE_DIR=G:/cygwin64/usr/local/include/gflags
-DGLOG_INCLUDE_DIR=G:/cygwin64/usr/local/include/glog
-DDOUBLECONV_INCLUDE_DIR=G:/cygwin64/usr/local/include/double-conversion
-DFOLLY_SOURCE_DIR=G:/cygwin64/home/Forough/w_f

The generating concluded to this result:

When I run :make -j I got this result:

Although I added these code to folly/system/ThreadId.h , I receive the mentioned error.
#if __linux
#include <folly/portability/SysSyscall.h>*/
#elif defined(_WIN32) || defined(_WIN64)
#include <folly/portability/windows.h>

Please help me with the problem

[foroughmajidi]

I solved the above issue (folly/system/threadid.h) with:
#ifdef (CYGWIN)
#include <folly/portability/windows.h>
#endif
But subsequently I faced to this error in(folly/portability/windows.h):

If I comment direct.h ,these errors would be occurred:

Before all of the above issues I faced to this error:

Converting memrchr() to memchr() ,I handled the problem but this is not the correct solution.

What's your suggestion for it?

[Orvid]

We've not actually tested folly with cygwin or mingw, only MSVC, so there are likely quite a few errors with cygwin and mingw unfortunately.

I have no idea how to deal with the include errors, but for memrchr, just #include <folly/portability/String.h>

[foroughmajidi]

Thanks for you answer .
I try to build wdt with MSVC, which uses folly.
But why is it expressed that cygwin should be used to build wdt on windows ?
However wdt uses folly.