```
$ cat /opt/jruby/lib/ruby/gems/shared/extensions/universal-java-1.8/2.5.0/linux_stat-1.6.0/mkmf.log
" -o conftest -I/include/universal-java1.8 -I/opt/jruby/lib/ruby/include/ruby/backward -I/opt/jruby/lib/ruby/include -I.     -fno-omit-frame-pointer -fno-strict-aliasing  -fexceptions  conftest.c  -L. -L/opt/jruby/lib    -m64      "
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <ruby.h>
4: int main(int argc, char **argv)
5: {
6:   return 0;
7: }
/* end */

```