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m4: crypt_xpg6.m4 - Define _DEFAULT_SOURCE for current glibc
Current glibc no longer implements the CRYPT extension, so it does not declare crypt in <unistd.h> in strict standard modes. The check defines _XOPEN_SOURCE, which enables one of these modes. Defining _DEFAULT_SOURCE as well again makes available the crypt function prototype. This avoids a configure check result change with compilers which do not support implicit function declarations.
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