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This patch fixes the runtime error when libmilter is used with Postfix:
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"unix_send_fd: your system has no support for file descriptor passing"
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The issue has been fixed upstream in 20170618 update to Postfix v.3.3:
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http://postfix.1071664.n5.nabble.com/Fix-check-for-file-descriptor-passing-td90983.html
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This patch must be removed before compiling Postfix v.3.3.*
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--- a/src/util/sys_defs.h
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+++ b/src/util/sys_defs.h
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@@ -804,7 +804,7 @@ extern int initgroups(const char *, int)
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#define KERNEL_VERSION(a,b,c) (LINUX_VERSION_CODE + 1)
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#endif
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,2,0)) \
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- || (__GLIBC__ < 2)
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+ || (defined(__GLIBC__) && __GLIBC__ < 2)
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#define CANT_USE_SEND_RECV_MSG
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#define DEF_SMTP_CACHE_DEMAND 0
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#else
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