Install failed on Windows 10

[tddaniel]

so I get on error when trying to install
I have the latest gsl libraries installed and on the path
ruby installed using ruby windows installer, version 2.4.3 64 bit.
i run gem install gsl
and get

        ERROR: Failed to build gem native extension.
    current directory: C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/gsl-2.1.0.3/ext/gsl_native
C:/Ruby24-x64/bin/ruby.exe -r ./siteconf20180102-5768-1uj9tbr.rb extconf.rb

...

compiling fit.c
compiling fresnel.c
fresnel.c:17:21: warning: 'sqrt_pi_2' defined but not used [-Wunused-const-variable=]
 static const double sqrt_pi_2   = 1.2533141373155002512078826424; /* sqrt(pi/2) */
                     ^~~~~~~~~
compiling function.c
compiling geometry.c
compiling graph.c
compiling gsl.c
compiling gsl_narray.c
compiling gsl_nmatrix.c
compiling histogram.c
compiling histogram2d.c
compiling histogram3d.c
compiling histogram3d_source.c
compiling histogram_find.c
compiling histogram_oper.c
compiling ieee.c
compiling integration.c
compiling interp.c
compiling interp2d.c
interp2d.c: In function 'rb_gsl_interp_evaluate':
interp2d.c:104:55: warning: format '%d' expects argument of type 'int',
 but argument 4 has type 'size_t {aka long long unsigned int}' [-Wformat=]
     rb_raise(rb_eTypeError, "size mismatch (za:%d != %d)", (int) zsize,
                                                      ~^
                                                      %I64d
       (int) xsize*ysize);
...

followed by similar issues compiling some other files.
am I missing some dependency or something simple I haven't thought of?
I can post the whole out file if needed or is there a way to link it?