Hello,

I'm trying to install Qwt 6.1.3 on Qt 6.7.0, but whenever I try:
Qt Code: 
  1. mingw32-make
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I receive the following error message:

Qt Code: 
  1. C:\Qwt-6.1.3\qwt-6.1.3>mingw32-make
  2. cd src\ && ( if not exist Makefile C:\Qt\6.7.0\mingw_64\bin\qmake.exe -o Makefile C:\Qwt-6.1.3\qwt-6.1.3\src\src.pro ) && mingw32-make -f Makefile
  3. mingw32-make[1]: Entering directory 'C:/Qwt-6.1.3/qwt-6.1.3/src'
  4. mingw32-make -f Makefile.Release all
  5. mingw32-make[2]: Entering directory 'C:/Qwt-6.1.3/qwt-6.1.3/src'
  6. compiling qwt_abstract_scale_draw.cpp
  7. In file included from qwt_abstract_scale_draw.h:15,
  8.                  from qwt_abstract_scale_draw.cpp:10:
  9. qwt_text.h:142:41: **error: 'null' is not a member of 'QString'**
  10.   142 |     QwtText( const QString & = QString::null,
  11.       |                                         ^~~~
  12. mingw32-make[2]: *** [Makefile.Release:5651: release/qwt_abstract_scale_draw.o] Error 1
  13. mingw32-make[2]: Leaving directory 'C:/Qwt-6.1.3/qwt-6.1.3/src'
  14. mingw32-make[1]: *** [Makefile:49: release-all] Error 2
  15. mingw32-make[1]: Leaving directory 'C:/Qwt-6.1.3/qwt-6.1.3/src'
  16. mingw32-make: *** [Makefile:53: sub-src-make_first-ordered] Error 2
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I'm not sure what that means. I used the location of qtenv2.bat in mingw_64 to set up the Qt command prompt since "Qt version for Desktop" didn't show up for me. I didn't modify anything in the Qwt build or config.pri files, and I'm uncertain if I should have. I'm honestly at a loss about what to do next. Can anyone assist me?