Denis Davydov d579231967 flex: use 2.6.3. by default (#8154) ... Fixes #8152 Flex 2.6.4 doesn't build with gcc@7:. This sets Flex 2.6.3 as the preferred version. The flex package had a conflict directive for this but originally the recorded conflict was specific to ubuntu; this appears to be an issue on multiple operating systems so this also updates the conflict to be more general and adds a comment which links to the relevant issues.		2018-05-17 13:58:29 -07:00
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spack	flex: use 2.6.3. by default (#8154)	2018-05-17 13:58:29 -07:00