This is usually a lib configuration problem. Try removing all the lib configuration and compile it again. If you get the same error, the libraries weren’t configured correctly.

any idea?

One problem is that numerous programming language books *do* have example problems. Another is that if you did publish the example database, then invariably, their solutions would start appearing.

My best idea so far is a heavily-moderated wiki, with no solutions allowed, or a proprietary database sold only to employers. If solutions appear online (or someone writes a book and starts selling it), then all testing happens in the interview (no take-homes).

Now someone needs to register a domain, set up the wiki and categorizing/rating systems, and start transcribing problems from texts. Simple, right?

This is the simple elegance in a solution that I always crave along with information and examples to help me actually understand it. I don’t need to blindly copy and paste surplus code. I can use this to write my own and know what I’m doing.

Your preferred way to learn is what I and everybody else is doing, after all, we don’t have much of a choice. Advanced technical books with good didactics and exercises are so rare that when they are released it often results in great acclaim for their authors (like Kathy Sierra).

I really don’t like the idea of having myself to create the exercises from which my skills depend: at the time I’m learning, it’s unlikely I’m going to foresee the challenges to which I’m gonna be exposed at work, hence the need for exercises created by someone with a higher degree of expertise. Moreover, technical difficulties oftentimes unfold in a way these books do not predict, or mention in a way that is far too theoretic.

I always find the exercises were not written for me, but for some other reader. Plus, it seems that books with exercises are too didactic. Using an anology, when I buy a grammar, I look for the ones with no exercises. If I want exercises, I will find my own way of practicing, like reading texts on the web or talking to people on Skype.

*Examples*, on the other hand, are always welcome (especially in programming). An example may save a not-so-clear paragraph or chapter from being incomprehensible.

[…]This guide explains how to create a wxWidgets project using NetBeans on Windows (including Vista). It is divided in two parts: the first lists the steps necessary to compile wxWidgets on Windows (using MinGW + MSYS); the second part explains how t…