it's not actually a bug, but gsl_type.h has a section like this:
#ifdef WIN32
# ifdef GSL_DLL
# ifdef DLL_EXPORT
# define GSL_VAR extern __declspec(dllexport)
# define GSL_EXPORT __declspec(dllexport)
# else
# define GSL_VAR extern __declspec(dllimport)
# define GSL_EXPORT __declspec(dllimport)
# endif
# else
# define GSL_VAR extern
# define GSL_EXPORT
# endif
#else
# define GSL_VAR extern
# define GSL_EXPORT
#endif
"DLL_EXPORT" is a general name and every dll may redefine it to export its
symbols. This name causes trouble in some situations, eg when someone uses
libgsl.dll in another dll (foo.dll) where it need to import GSL symbols into,
and export other symbols from foo.dll and this will end up with linkage errors.
It's better to rename it as GSL_DLL_SOURCE or something unique like that.
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