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configure.ac: Add c++17 header <optional>.

This commit is contained in:
Jason Volk 2017-12-28 13:43:45 -07:00
parent b22d96977a
commit f54b14ae07

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@ -430,6 +430,7 @@ RB_CHK_SYSHEADER([condition_variable], [CONDITION_VARIABLE])
RB_CHK_SYSHEADER([random], [RANDOM])
RB_CHK_SYSHEADER([bitset], [BITSET])
RB_CHK_SYSHEADER([string_view], [STRING_VIEW])
RB_CHK_SYSHEADER([optional], [OPTIONAL])
dnl windows platform
RB_CHK_SYSHEADER([windows.h], [WINDOWS_H])