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