Can anybody create this one to mine instead of closed-source Minergate?
They've released open-source instructions for the miner.
Does MinerGate still have withdrawal problems?
I know, but there are two points I keep in mind:
1) Open-source pools can attract those users that don't like closed-source pools in general. And having just a 3rd party mining tool connected to a private pool is not sufficient. After all, is there any way to check what's really going on with the payments?
2) I personally couldn't make Bytecoin compile with their instructions. Although I have all dependencies, I run into "internal compiler error" on Ubuntu 14.04. I'm not an advanced Ubuntu user, but trying to beat the error and even reinstalling different versions of Ubuntu (12.10 & 13.04) I arrived at nothing although the compiler hits this bug on different % of the job.
I've tried Minergate's withdrawal on Saturday, it worked for 300k BCNs.