add in the title something like (for Linux users only) 
Well, yes i usually develop for linux, but the code can be running on windows through the ubuntu shell. Also with Mingw64.
I was able to compile under Windows using Mingw64!! 
That is what i'm talking about
Thanks!1. For rehashaddress, what hash algorithm do you use?
for now only sha256, but i will add some extra options.
2. Looking at README.md, looks like this tool only support legacy address (address with prefix 1), is it true?
Yes that is true for now, i will plan to add some extra kind of address but i'm still learning and testing it.
3. You might want to mention version of C (and other dependency/utility), so other people (and yourself in the future) could save some time.
Excellent yes, i will add it in the readme, some times I forget that most users doesn't know linux, also i forget that most user never read the readme LOL
Here is the Windows version:
https://github.com/WanderingPhilosopher/Windows-ECC-Tools
You may want to add the link in your main post so people who use Windows know they can use your program as well.
https://github.com/WanderingPhilosopher/Windows-ECC-Tools
You may want to add the link in your main post so people who use Windows know they can use your program as well.
I will add it, also to the readme in github.
Thanks!