latest commit of panama-foreign branch jextract has strange error...

[Mark Hammons]

Hi all,

When I use jextract from the latest panama-foreign commit (58596:ff086ae3cfac) 
I get the following error: java.lang.RuntimeException: /usr/include/zconf.h:
247:14: fatal error: 'stddef.h' file not found

it comes from this call of jextract: jextract /usr/include/zlib.h -L /usr/
lib64 --record-library-path -l z -t zlib. I'm guessing this is a bug?

~Mark