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setpriority() and PRIO_PROCESS under Cygwin

I am trying to compile a free high-quality chess database, known as Scid:

Here is the error I get

~/wares/scid-3.5a $ cat make.err
In file included from src/game.h:24,
from src/tkscid.h:20,
from src/tkscid.cpp:16:
src/textbuf.h: In member function `void TextBuffer::ClearTranslation(char)':
src/textbuf.h:70: warning: array subscript has type `char'
src/tkscid.cpp: In function `int sc_info_priority(void*, Tcl_Interp*, int,
const char**)':
src/tkscid.cpp:8363: error: `PRIO_PROCESS' undeclared (first use this function)
src/tkscid.cpp:8363: error: (Each undeclared identifier is reported only once
for each function it appears in.)
src/tkscid.cpp:8363: error: `setpriority' undeclared (first use this function)
src/tkscid.cpp:8368: error: `getpriority' undeclared (first use this function)
make: *** [src/tkscid.o] Error 1
~/wares/scid-3.5a $

==== end paste , text continue =====

I saw some assorted messages on the Cygwin mail archives about this, but issueing a find on /usr/include did not help. Nor did getting a version of pthreads-win32 as there is no PRIO_PROCESS defined there.

Can anyone suggest a solution for getting code making calls to setpriority() and using PRIO_PROCESS to compile under Cygwin?


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