Did not occur when I re-ran mingw-w64-install.exe as administrator. It should be...
*** Error in `/usr/bin/x86_64-w64-mingw32-ld': free(): invalid pointer
As I can see you using not my builds, but cross-compiler. Moreover, this error is...
mingw-w64-install.exe chooses wrong rev
My bad, sorry. Fixed.
Please show the output of the 'x86_64-w64-mingw32-g++ -v' cmd.
x86_64-w64-mingw32-g++ -v ?
Installer fails without 7-Zip present