cgo: C compiler “gcc” not found: exec: “gcc”: executable file not found in %PATH%

path:

https://sourceforge.net/projects/mingw-w64/files/mingw-w64/
https://nchc.dl.sourceforge.net/project/mingw-w64/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/installer/mingw-w64-install.exe

add C:\Program Files\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin to system PATH