diff -u -r liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.c liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.c
--- liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.c	2009-11-03 06:55:28.000000000 +0100
+++ liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.c	2020-01-08 18:42:27.748352503 +0100
@@ -55,7 +55,7 @@
 #ifdef WIN32
 #define _WILLWINSOCK_
 #endif
-#define _BSD_SOURCE
+#define DEFAULT_SOURCE
 #include <X11/Xos.h>
 #include <X11/Xfuncs.h>
 #include <stdio.h>
diff -u -r liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.h liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.h
--- liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.h	2009-11-03 06:52:21.000000000 +0100
+++ liblbxutil-1.1.0/src/lbx_zlib/lbx_zlib.h	2020-01-08 18:38:26.711719446 +0100
@@ -136,9 +136,9 @@
 #endif
 
 /* lbx_zlib.c */
-unsigned long stream_out_compressed;
-unsigned long stream_out_uncompressed;
-unsigned long stream_out_plain;
-unsigned long stream_in_compressed;
-unsigned long stream_in_uncompressed;
-unsigned long stream_in_plain;
+extern unsigned long stream_out_compressed;
+extern unsigned long stream_out_uncompressed;
+extern unsigned long stream_out_plain;
+extern unsigned long stream_in_compressed;
+extern unsigned long stream_in_uncompressed;
+extern unsigned long stream_in_plain;
diff -u -r liblbxutil-1.1.0/src/lbx_zlib/reqstats.c liblbxutil-1.1.0/src/lbx_zlib/reqstats.c
--- liblbxutil-1.1.0/src/lbx_zlib/reqstats.c	2009-11-03 06:39:14.000000000 +0100
+++ liblbxutil-1.1.0/src/lbx_zlib/reqstats.c	2020-01-08 18:40:15.229805230 +0100
@@ -43,8 +43,8 @@
 
 #define LBX_CODE 136 /* XXX - this should not be hardcoded - on todo list */
 
-extern unsigned long stream_in_compressed;
-extern unsigned long stream_in_plain;
+unsigned long stream_in_compressed;
+unsigned long stream_in_plain;
 extern unsigned long stream_in_packet_header_bytes;
 extern unsigned long stream_in_uncompressed_bytes;