Fixing gcc undefined include<> by manually installing library - c++

Question

I am running the golang command "go get -t github.com/otiai10/gosseract" , causing the error tessbridge.cpp:5:10: fatal error: leptonica/allheaders.h: No such file or directory, #include <leptonica/allheaders.h>. That library is https://github.com/DanBloomberg/leptonica. How do I install it from source so that the gcc command will work.
Before that command was producing the error "gcc not found", but then I followed https://superuser.com/questions/1294343/install-gcc-in-git-for-windows-bash-environment to setup gcc on windows.
I have not been able to find any references for what gcc expects when it encounters an include<>, and where those files should be located on the file system for it to link properly. Is it possible to install this library manually?

Answer 1

Here is much simpler solution for you. There was no need to install gcc on git-bash.
Install MSYS2. Follow complete installation guide.
On MSYS2 console enter the following commands :
pacman -S mingw-w64-x86_64-gcc
pacman -S mingw-w64-x86_64-leptonica
Add C:\msys64\mingw64\bin to PATH.
First step can be further simplified if you use Chocolatey. Just run these commands in elevated powershell : (Ignore first command if choco is already installed.)
Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
Reopen elevated powershell and run these:
choco install -y msys2 --params="/InstallDir:C:\msys64"
refreshenv
$env:Path += ";C:\msys64\usr\bin"
pacman -S mingw-w64-x86_64-gcc
pacman -S mingw-w64-x86_64-leptonica
[Environment]::SetEnvironmentVariable("Path", "C:\msys64\mingw64\bin;" + $env:Path, "User")