extconf.rb in national_grid-0.1.2

- old
+ new

@@ -1,8 +1,10 @@
 require "mkmf"
 require_relative "../ostn02c"
 
 dir_config "ostn02c", [OSTN02C.include_path], [OSTN02C.lib_path]
 
+OSTN02C.make or abort "building libostn02 failed"
+
 abort "libostn02 not found" unless have_library "ostn02", "test(false)", "OSTN02.h"
 
 create_makefile "national_grid/national_grid"