I looked at some code of x11, x13, x15 coins, and I can say this code is often based on bitcoin 0.6.x or similar. It is very hard for me to compile on Windows.

Latest official version of Quark is based on bitcoin 0.8.3.x and can be compiled very easy compiled on Windows. Same for Litecoin 0.8.x.

Newest next version of Quark will be based on bitcoin v0.9.x.x and already now you can compile for Windows at the easiest way.

I am very close to conclude that many x11, x13, x15 coins are improved with many fancy things, but they are based on very old bitcoin code v0.6.x no matter how they artificially risen version number. It means it will be very hard to maintain it or developed it on the right way.

I am fresh in researching this.

Can someone confirm me if I am right?   For Windows only.