Appveyor debug

Author: orgads

ext/tiny_tds/extconf.rb

@@ -155,6 +155,11 @@ def configure
         config = if host=~/mingw/
           host=~/x86_64/ ? 'mingw64' : 'mingw'
         end
+        c_perl = 'C:/Perl/bin'
+        if File.directory?(c_perl)
+          ENV['PATH'] = c_perl
+          ENV['PERL'] = 'perl'
+        end
         args = [ "CFLAGS=-DDSO_WIN32",
             "./Configure",
             "no-shared",