Appveyor debug

Author: orgads

ext/tiny_tds/extconf.rb

@@ -155,7 +155,10 @@ def configure
         config = if host=~/mingw/
           host=~/x86_64/ ? 'mingw64' : 'mingw'
         end
+        c_perl = 'C:/Perl/bin/perl.exe'
+        perl = File.exist?(c_perl) ? c_perl : 'perl'
         args = [ "CFLAGS=-DDSO_WIN32",
+            perl,
             "./Configure",
             "no-shared",
             configure_prefix,