GSL 2.7: ‘gsl_multilarge_linear_type’ {aka ‘struct <anonymous>’} has no member named ‘matrix_ptr’ when installing with GSL 2.6

[hakonhagland]

After applying PR #236, I generated a distribution

$ PATH="/opt/gsl/gsl-2.7/bin:$PATH" perl Build.PL
$ ./Build
$ LD_LIBRARY_PATH=/opt/gsl/gsl-2.7/lib ./Build test
$ ./Build dist

then tried to install this dist with GSL 2.6

$ cp Math-GSL-0.42.tar.gz /tmp
$ tar zxvf Math-GSL-0.42.tar.gz
$ cd Math-GSL-0.42
$ PATH="/opt/gsl/gsl-2.6/bin:$PATH" perl Build.PL
$ ./Build
[...]
cc -I/home/hakon/perlbrew/perls/perl-5.32.0/lib/5.32.0/x86_64-linux/CORE -c -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -fPIC -I/opt/gsl/gsl-2.6/include -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wno-sometimes-uninitialized -Wno-unused-function -Wno-unused-value -Wno-unused-function -Wno-unused-variable -Wno-gnu -g -fPIC -fno-omit-frame-pointer -I/opt/gsl/gsl-2.6/include -o xs/Multilarge_wrap.2.6.o xs/Multilarge_wrap.2.6.c
xs/Multilarge_wrap.2.6.c: In function ‘_wrap_gsl_multifit_linear_lcurvature’:
xs/Multilarge_wrap.2.6.c:6563:19: warning: implicit declaration of function ‘gsl_multifit_linear_lcurvature’; did you mean ‘gsl_multifit_linear_lcurve’? [-Wimplicit-function-declaration]
 6563 |     result = (int)gsl_multifit_linear_lcurvature((gsl_vector const *)arg1,(gsl_vector const *)arg2,(gsl_vector const *)arg3,(gsl_vector const *)arg4,arg5,arg6);
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                   gsl_multifit_linear_lcurve
xs/Multilarge_wrap.2.6.c: In function ‘_wrap_gsl_multilarge_linear_type_matrix_ptr_set’:
xs/Multilarge_wrap.2.6.c:10933:21: error: ‘gsl_multilarge_linear_type’ has no member named ‘matrix_ptr’
10933 |     if (arg1) (arg1)->matrix_ptr = (gsl_matrix const *(*)(void const *))arg2;
      |                     ^~
xs/Multilarge_wrap.2.6.c: In function ‘_wrap_gsl_multilarge_linear_type_matrix_ptr_get’:
xs/Multilarge_wrap.2.6.c:10963:53: error: ‘gsl_multilarge_linear_type’ has no member named ‘matrix_ptr’
10963 |     result = (gsl_matrix *(*)(void const *)) ((arg1)->matrix_ptr);
      |                                                     ^~
xs/Multilarge_wrap.2.6.c: In function ‘_wrap_gsl_multilarge_linear_type_rhs_ptr_set’:
xs/Multilarge_wrap.2.6.c:10997:21: error: ‘gsl_multilarge_linear_type’ has no member named ‘rhs_ptr’
10997 |     if (arg1) (arg1)->rhs_ptr = (gsl_vector const *(*)(void const *))arg2;
      |                     ^~
xs/Multilarge_wrap.2.6.c: In function ‘_wrap_gsl_multilarge_linear_type_rhs_ptr_get’:
xs/Multilarge_wrap.2.6.c:11027:53: error: ‘gsl_multilarge_linear_type’ has no member named ‘rhs_ptr’
11027 |     result = (gsl_vector *(*)(void const *)) ((arg1)->rhs_ptr);
      |
[...]