I'm trying to build GCC 10.1 on my 64bit Windows 10 PC via msys2 but I get this strange error that I don't understand. I didn't set the 3 switches: --host, --build and --target when I ./configured the GCC. So GCC picked these:
checking build system type... x86_64-pc-msys
checking host system type... x86_64-pc-msys
checking target system type... x86_64-pc-msys
I had provided all the required dependencies also updated the msys2: pacman -Syuu
checking if mkdir takes one argument... no
*** Configuration x86_64-pc-msys not supported
make[2]: *** [Makefile:4443: configure-stage1-gcc] Error 1
make[2]: Leaving directory '/c/gcc'
make[1]: *** [Makefile:25627: stage1-bubble] Error 2
make[1]: Leaving directory '/c/gcc'
make: *** [Makefile:1001: all] Error 2