The LAPACK version is right in the header:
Definitions and prototypes for LAPACK v3.2.1 as provided Apple Computer.
In particular, this is a modified version of clapack -3.2.1, in which there were some of the commonly used routines (for example, the LU factor and solution, Cholesky decomposition, etc.) Replaced by manually configured implementations.
Edit: Please note that I said that this is a modified LAPACK-3.2.1. In particular, among other modifications, the slamch and dlamch have been changed to make them both thread safe and re-operational. If you come across any routines that are not thread safe, this is a serious bug that you should report .
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