Unfortunately for the moment I can tell you exactly because I have access
to a Windows PC only at work.
What I remember is that I ran "make" normally after "./configure" and I
took note of the build command for the DLL so that I can re-issue the
command by replacing glscblas with openblas. To capture the command I have
redirected the make's output into a file.
May be someone in the mailing list can suggest a more clean way of changing
the way to build the GSL shared library. For the moment I cannot suggest