text: #ifndef EXTCONF_H
  #define EXTCONF_H
  #define HAVE_RUBY_THREAD_H 1
  #define HAVE_RB_THREAD_CALL_WITH_GVL 1
  #define HAVE_RB_THREAD_CALL_WITHOUT_GVL 1
  #define HAVE_FFI_PREP_CIF_VAR 1
  #define USE_INTERNAL_LIBFFI 1
  #define RUBY_1_9 1
  #endif
  