diff -Naur -x '*.orig' -x '*.rej' 10.3-0/FreeFileSync/Source/Makefile 10.3-2/FreeFileSync/Source/Makefile
--- 10.3-0/FreeFileSync/Source/Makefile   2018-08-07 05:03:33.000000000 -0400
+++ 10.3-2/FreeFileSync/Source/Makefile   2018-08-15 22:25:06.694355202 -0400
@@ -9,7 +9,7 @@
            -Wall -Wfatal-errors -Wmissing-include-dirs -Wswitch-enum -Wcast-align -Wshadow -Wnon-virtual-dtor \
            -O3 -DNDEBUG `wx-config --cxxflags --debug=no` -pthread

-LINKFLAGS = -s -no-pie `wx-config --libs std, aui --debug=no` -pthread
+LINKFLAGS = -s -no-pie `wx-config --libs std, aui --debug=no` -lz -pthread

 #Gtk - support recycler/icon loading/no button border/grid scrolling
 CXXFLAGS  += `pkg-config --cflags gtk+-2.0`
diff -Naur -x '*.orig' -x '*.rej' 10.3-0/FreeFileSync/Source/RealTimeSync/Makefile 10.3-2/FreeFileSync/Source/RealTimeSync/Makefile
--- 10.3-0/FreeFileSync/Source/RealTimeSync/Makefile  2018-08-07 05:03:33.000000000 -0400
+++ 10.3-2/FreeFileSync/Source/RealTimeSync/Makefile  2018-08-15 22:25:15.968461418 -0400
@@ -6,7 +6,7 @@
            -Wall -Wfatal-errors -Wmissing-include-dirs -Wswitch-enum -Wcast-align -Wshadow -Wnon-virtual-dtor \
            -O3 -DNDEBUG `wx-config --cxxflags --debug=no` -pthread

-LINKFLAGS = -s -no-pie `wx-config --libs std, aui --debug=no` -pthread
+LINKFLAGS = -s -no-pie `wx-config --libs std, aui --debug=no` -lz -pthread

 #Gtk - support "no button border"
 CXXFLAGS  += `pkg-config --cflags gtk+-2.0`