why for debian -lblas links to libblas.so.3gf instead of libblas.so?

[Jichao Yin <jichao.yin@gmail.com>]

Dear all,

I found that

-lblas links a program to libblas.so.3gf
-llapack links a program to liblapack.so.3gf

only those two sorts of libraries have and link to 3gf version of .so (including both reference netlib blas and ATLAS blas, lapack).

On the other side, redhat distributions -lblas links to libblas.so and -llapack links to liblapack.so.

Is there anyone who can clarify why debian uses .so.3gf only for -lblas and -llapack? 
Actually I found in debian libblas.so -> libblas.so.3gf ultimately....   What is relationship between the two?

Thank you!

Sincerely,
Jichao

Jichao Yin