Gentoo's Bugzilla –
Attachment 516522 Details for
Bug 645666sci-visualization/kst-2.0.8 - In file included from .../work/Kst-2.0.8/src/plugins/fits/exponential_unweighted/fitexponential_unweighted.cpp:24:0: .../Kst-2.0.8/src/plugins/fits/exponential_unweighted/../non_linear.h: error: ‘struct gsl_multifit_fdfsolver