compiling problems

[<di...@xs...>]

Hi all, I am wrestling through the bode example but I have
some strange problem with it. 

Last week I tried to get QT-embedded working, I succeeded
but I couldn't compile the qwt examples. I tried some
options in the Makefiles but none of them worked. I have the
simple_plot app modified somewhat and it compiles. 

Then I started to integrate parts of bode.cpp in my app and
I couldn't compile it anymore. Something went wrong with a
virtual table. Anyway, bode (original one) didn't compile on my laptop but
I blamed that modifications I made to the Makefile. So, I
installed qwt (0.2h) again, compiled it again, changed my
CPLUS_INCLUDE_PATH and LD_LIBRARY_PATH to this new qwt dir
and tried to compile the examples. But still bode and
simple_plot don't compile. Both apps give me some undefined
references. 

Do I overlook something simple? Are compiler and lib
versions extremely important? Haven't I read some important
doc? 

TIA, 

Dirk