MakeFile Error topic

Hi,
When I make compile, I get the following error ;

/usr/bin/ld: cannot find -lblablaService
/usr/bin/ld: cannot find -lblablaResponse

These are added to the end of "LIBS" in the related make file as follows ;

LIBS = -lblablaExecutor -lblablaService -lblablaResponse

I don't have that much info about makefiles. Could you please inform me about the possible causes of this kind of issue ?

Thanks in advance for the replies,
Cranberries