--- src/mtserver/Makefile.in.orig	2019-05-13 08:40:47 UTC
+++ src/mtserver/Makefile.in
@@ -13,7 +13,7 @@
 
 CC      = @CC@ 
 CXX     = @CXX@ 
-CFLAGS  = @CFLAGS@ -I. -I..
+CFLAGS  = @CFLAGS@ -D__BSD_VISIBLE=1 -I. -I..
 CXXFLAGS= @CXXFLAGS@ -I. -I..
 CPPFLAGS= @CPPFLAGS@
 LDFLAGS = @LDFLAGS@