help, Wildcard Characters use

[YKen]

Dear sir,

         I am very sorry to ask this question a letter I find on the
Internet a lot of information, but still do not understand to use, so
if you can, please teach me, thank you.

        In Makefile, first line write it. This line of what is the
point? /abc & /xyz is folder name
=================================
        [ /abc /xyz ]
=================================

thank u a lot

Ken