pkgsrc on slackware: freetype2 missing windows.h

[Andreas Beck <lists%openmail.one@localhost>]

Hello,

ive this problem with slackware-current and pkgsrc-current:
/usr/pkgsrc/graphics/freetype2/work/freetype-2.9.1/src/base/ftver.rc:19:9: 
fatal error: windows.h: No such file or directory
 #include<windows.h>
         ^~~~~~~~~~~
compilation terminated.
windres: preprocessing failed.
make: *** 
[/usr/pkgsrc/graphics/freetype2/work/freetype-2.9.1/builds/freetype.mk:263: 
/usr/pkgsrc/graphics/freetype2/work/freetype-2.9.1/objs/ftver.lo] Error 1
*** Error code 2

Knows anyone about it?

Best Regards,
Andreas