Justin S 8c173da4b7 nettle: fix broken build (#11611) ... * nettle: force C99 build * nettle: update to use c99_flag from @alalazo Co-Authored-By: Massimiliano Culpo <massimiliano.culpo@gmail.com>		2019-06-05 19:09:01 -05:00
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spack	nettle: fix broken build (#11611)	2019-06-05 19:09:01 -05:00