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[tmodes <1892420@xxxxxxxxxxxxxxxxxx>]

What is the error the build system report without the patch?

Also before applying the patch  I would be interested in a comparison between self-contained levmar and levmar+LAPACK.
The photometric optimizer is the only part of Hugin which is using the embedded levmar lib. I don't know if using LAPACK (+BLAS) brings a speed or stability improvement. If there is no improvement of using LAPACK then maybe the LAPACK detection should be removed. When there is an improvement with LAPACK I would be interested how large this improvement is. 

** Changed in: hugin
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1892420

Title:
  levmar uses BLAS when built with LAPACK, but Hugin does not link
  against BLAS

Status in Hugin:
  Incomplete

Bug description:
  ```
  hugin-2019.2.0/src/foreign/levmar/misc_core.c:45:#define GEMM LM_MK_BLAS_NAME(gemm)
  ```

  This function is a BLAS function:
  https://en.wikipedia.org/wiki/Basic_Linear_Algebra_Subprograms#Level_3

  Thus, since levmar is built as a static library, Hugin itself should
  call `find_package(BLAS)` and `huginbase` should link against
  `BLAS_LIBRARIES`.

  Attached patch fixes this (in an admittedly slightly crude way) for
  me.

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