Qt and gsl library problem.

ld: warning: in /usr/local/lib/libgsl.dylib, file is not of required architecture

Solution: 

open the Makefile and: 

1. CFLAGS: get rid of "arch i386'. 

2. CXXFLAGS: get rid of "arch i386"

3. comment LFLAGS. 

4. QMAKE_COMP_QMAKE_OBJECTIVE_CFLAGS: get rid of "arch i386". 

then save the Makefile and do: 

> make clean

> make

you will get warning but it should pass!