MinGW build error when sleep re#defined as Sleep

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When building GraphicsMagick-1.3.22 with MinGW I encounter an error
compiling
blob.c. I didn't understand the message:
../GraphicsMagick-1.3.22/magick/studio.h:338:29: error: expected
declaration spe
cifiers or '...' before '(' token
 #  define sleep(sec)  Sleep(sec * 1000)
so I compiled the preprocessed blob.c:

$ gcc -c blob.i
In file included from c:/MinGW/local/include/zconf.h:452:0,
                 from c:/MinGW/local/include/zlib.h:34,
                 from ../GraphicsMagick-1.3.22/magick/blob.c:60:
c:\mingw\include\unistd.h:139:73: error: expected declaration specifiers or
'...
' before '(' token
 unsigned __cdecl __MINGW_NOTHROW sleep( unsigned );
                                                                         ^
c:\mingw\include\unistd.h:143:16: error: expected declaration specifiers or
'...
' before '(' token
 unsigned sleep( unsigned period ){ return __mingw_sleep( period, 0 ); }

The problem seems to be that MinGW has a header unistd.h that declares
sleep(unsigned secs) and causes the attempt to redefine it as Windows API
function Sleep(DWORD milliseconds) in magick/studio.h to fail, i.e.

#if defined(MSWINDOWS)
/* various declarations */
#  undef sleep
#  define sleep(sec)  Sleep(sec * 1000) /* ERROR! */
#  if !defined(HAVE_TIFFCONF_H)
#    define HAVE_TIFFCONF_H
#  endif
#endif /* defined(MSWINDOWS) */

Maybe there could be a HAVE_POSIX_SLEEP in magicj/magick_confi.h and then:
#if defined(MSWINDOWS)
...
#if !defined(HAVE_POSIX_SLEEP)
#  define sleep(sec) Sleep(sec * 1000)
#endif

Regards,
Test User.

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<div dir=3D"ltr"><div><div><div>When building GraphicsMagick-1.3.22 with Mi=
nGW I encounter an error compiling<br>blob.c. I didn&#39;t understand the m=
essage:<br>../GraphicsMagick-1.3.22/magick/studio.h:338:29: error: expected=
 declaration spe<br>cifiers or &#39;...&#39; before &#39;(&#39; token<br>=
=C2=A0#=C2=A0 define sleep(sec)=C2=A0 Sleep(sec * 1000)<br>so I compiled th=
e preprocessed blob.c:<br><br>$ gcc -c blob.i<br>In file included from c:/M=
inGW/local/include/zconf.h:452:0,<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 from c:/MinGW/=
local/include/zlib.h:34,<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 from ../GraphicsMagick-=
1.3.22/magick/blob.c:60:<br>c:\mingw\include\unistd.h:139:73: error: expect=
ed declaration specifiers or &#39;...<br>&#39; before &#39;(&#39; token<br>=
=C2=A0unsigned __cdecl __MINGW_NOTHROW sleep( unsigned );<br>=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^<br>c:\mingw\include\unistd.=
h:143:16: error: expected declaration specifiers or &#39;...<br>&#39; befor=
e &#39;(&#39; token<br>=C2=A0unsigned sleep( unsigned period ){ return __mi=
ngw_sleep( period, 0 ); }<br><br></div>The problem seems to be that MinGW h=
as a header unistd.h that declares<br></div>sleep(unsigned secs) and causes=
 the attempt to redefine it as Windows API<br>function Sleep(DWORD millisec=
onds) in magick/studio.h to fail, i.e.<br><br>#if defined(MSWINDOWS)<br>/* =
various declarations */<br>#=C2=A0 undef sleep<br>#=C2=A0 define sleep(sec)=
=C2=A0 Sleep(sec * 1000) /* ERROR! */<br>#=C2=A0 if !defined(HAVE_TIFFCONF_=
H)<br>#=C2=A0=C2=A0=C2=A0 define HAVE_TIFFCONF_H<br>#=C2=A0 endif<br>#endif=
 /* defined(MSWINDOWS) */<br><br></div><div>Maybe there could be a HAVE_POS=
IX_SLEEP in magicj/magick_confi.h and then:<br></div><div>#if defined(MSWIN=
DOWS)<br>...<br></div><div>#if !defined(HAVE_POSIX_SLEEP)<br></div><div>#=
=C2=A0 define sleep(sec) Sleep(sec * 1000)<br></div><div>#endif<br><br></di=
v><div>Regards,<br></div><div>Test User.<br></div></div>

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