TDA2EG-17: How to add New static lib on Linux (file.a)

Dear all,

I create a new static lib  , name is file.a , and I use some function from file.a

And I see VisionSDK_UserGuide_BuildSystem.pdf Chapter 8 Adding new library to appliation

Then I add my new library in MAKEFILE.MK

like this =>   LIBS += file.a 

But  happend error :  undefined reference to" "some function"

but it seems to have no effect

I would like to ask where to add the .a lib under LINUX to be included (VSDK 0307)

Thanks a lot!!

David.