Do you simply want to compile this project? I would recommend to use the console approach, it is easy and fast, and you don't have to fiddle around...
Do you want to convert it to a c::b project? Does the makefile something fancy? Or is it only a thing about compiling one single executable/library?
NOTE: This steps are not tested, it may be that there are errors...
if the makefile does something fancy:
1) create a new project (empty project) -> finish the wizard
2) Project->Properties
a) tick at "This is a custom Makefile" and enter the name of the makefile (the project should be in the same folder as the makefile)
b) ok
3) Add all files with Project -> Add files recursively
4) save and try to compile
if the makefile does nothing special (for ex. one simple target)
1) Create a project (empty project, or library, or console, dont know what your files are about)
2) Add all files recursively
if there are errors:
http://wiki.codeblocks.org/index.php/FAQ-Compiling_%28general%29#Q:_How_do_I_report_a_compilation_problem_on_the_forums.3Fif you give some more information we can help better...
greetings