Darrell Anderson wrote:

> I'm nowhere close to being qualifed to write something about
> CXX/CFLAGS. Somebody else (not you) should provide a paragraph
> addressing those variables.

Read the documentation for gcc and make.  They control how a program is 
compiled and can make a huge difference.  The developer should know what 
the options do before they are set.  Variables like CFLAGS and CXXFLAGS 
are often set or modified in a Makefile.

For qt based apps, it would also be helpful to read through the qmake 
manual as that generally is used, via a .pro file, to generate the 
Makefile for an application or library.

   -- Bruce