Re: [Trisquel-users] Help me making a small change in a C++ program

[onpon4]

What you're trying to do isn't possible. #define is a preprocessor command,  
executed at compile time. Any instances of USE_KCHMVIEWER get replaced in the  
code, before it is compiled, with the value of USE_KCHMVIEWER. So there isn't  
a way to change such constants at run-time, and "undefining" them doesn't  
make any sense.

What you need to do is modify the code to remove USE_KCHMVIEWER from the  
relevant decision(s). Probably, it should be removed entirely and replaced  
with a variable. I'm not familiar with VirtualBox, so I don't know how  
difficult this is. But the type you would want to use is bool.