Bug#960010: freefem++: FBTFS (error: multiple definition of ‘enum =?UTF-8?Q?CBLAS=5FSIDE=E2=80=99?=)

[Bas Couwenberg]

Source: freefem++
Version: 3.61.1+dfsg1-5
Severity: serious
Justification: makes the package in question unusable or mostly so
Control: block 959133 by -1

Dear Maintainer,

Your package FTBFS during the gsl transition.

The builog shows many errors like this:

 In file included from /usr/include/gsl/gsl_blas_types.h:28,
                  from /usr/include/gsl/gsl_matrix_complex_long_double.h:29,
                  from /usr/include/gsl/gsl_matrix.h:4,
                  from /usr/include/gsl/gsl_eigen.h:24,
                  from /usr/include/gsl/gsl_sf_mathieu.h:26,
                  from /usr/include/gsl/gsl_sf.h:31,
                  from gsl.cpp:32:
 /usr/include/gsl/gsl_cblas.h:46:6: error: multiple definition of ‘enum CBLAS_ORDER’
    46 | enum CBLAS_ORDER {CblasRowMajor=101, CblasColMajor=102};
       |      ^~~~~~~~~~~

https://buildd.debian.org/status/fetch.php?pkg=freefem%2B%2B&arch=amd64&ver=3.61.1%2Bdfsg1-5%2Bb3&stamp=1588901371&raw=0

Kind Regards,

Bas