dovecot/dovecot-configure-c99.patch

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m4: crypt_xxpg6.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.
Submitted upstream: <https://github.com/dovecot/core/pull/193>
diff --git a/m4/crypt_xpg6.m4 b/m4/crypt_xpg6.m4
index 0085b2ac76..3a288a3713 100644
--- a/m4/crypt_xpg6.m4
+++ b/m4/crypt_xpg6.m4
@@ -6,6 +6,7 @@ AC_DEFUN([DOVECOT_CRYPT_XPG6], [
#define _XOPEN_SOURCE 4
#define _XOPEN_SOURCE_EXTENDED 1
#define _XOPEN_VERSION 4
+ #define _DEFAULT_SOURCE
#define _XPG4_2
#define _XPG6
#include <unistd.h>