linear generalized real symmetric eigenvalue problem

hi.
i am solving a physics problem, and i need to solve eigenvalue
eguation: A.X=Lamda.B.X. A and B are symmetric, and B is not positive
definite.
all of the elements of B are nonnegative.
the matrices are at most 100 by 100.
could anyone help me white this problem? i need to know fortran
subroutines that can solve this problem accurately.
in advance i appriciate your help.
.

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