Upstream uses a libcurl more current than Fedora 29.
diff -Naur 10.11-0/FreeFileSync/Source/base/ffs_paths.cpp 10.11-1/FreeFileSync/Source/base/ffs_paths.cpp
--- 10.11-0/FreeFileSync/Source/base/ffs_paths.cpp	2019-04-12 07:59:45.368162920 -0400
+++ 10.11-1/FreeFileSync/Source/base/ffs_paths.cpp	2019-04-12 08:27:24.421735762 -0400
@@ -59,7 +59,7 @@
     ZEN_ON_SCOPE_EXIT(wxTheApp->SetAppName(appName));
 
     //if (isPortableVersion())
-    return appendSeparator(getExeFolderParentPath());
+    return appendSeparator("/usr") + appendSeparator("share") + appendSeparator("freefilesync");
     //else //use OS' standard paths
     //    return appendSeparator(utfTo<Zstring>(wxStandardPathsBase::Get().GetResourcesDir()));
 }
diff -Naur 10.11-0/FreeFileSync/Source/afs/libcurl/curl_wrap.h 10.11-1/FreeFileSync/Source/afs/libcurl/curl_wrap.h
--- 10.11-0/FreeFileSync/Source/afs/libcurl/curl_wrap.h	2019-04-12 07:59:45.130151956 -0400
+++ 10.11-1/FreeFileSync/Source/afs/libcurl/curl_wrap.h	2019-04-12 08:27:24.423735854 -0400
@@ -75,7 +75,7 @@
             ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_UNKNOWN_OPTION);
             ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_TELNET_OPTION_SYNTAX);
             ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_OBSOLETE50);
-            ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_OBSOLETE51);
+            //ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_OBSOLETE51);
             ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_PEER_FAILED_VERIFICATION);
             ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_GOT_NOTHING);
             ZEN_CHECK_CASE_FOR_CONSTANT(CURLE_SSL_ENGINE_NOTFOUND);
diff -Naur 10.11-0/FreeFileSync/Source/Makefile 10.11-1/FreeFileSync/Source/Makefile
--- 10.11-0/FreeFileSync/Source/Makefile	2019-04-12 07:59:45.042147902 -0400
+++ 10.11-1/FreeFileSync/Source/Makefile	2019-04-12 08:27:42.062542410 -0400
@@ -1,10 +1,10 @@
-EXENAME = FreeFileSync_$(shell arch)
+EXENAME = FreeFileSync
 
 CXXFLAGS = -std=c++2a -pipe -DWXINTL_NO_GETTEXT_MACRO -DLIBSSH2_OPENSSL -I../.. -I../../zenXml -include "zen/i18n.h" -include "zen/warn_static.h" \
            -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
 
 
 CXXFLAGS  += `pkg-config --cflags openssl`
diff -Naur 10.11-0/FreeFileSync/Source/RealTimeSync/Makefile 10.11-1/FreeFileSync/Source/RealTimeSync/Makefile
--- 10.11-0/FreeFileSync/Source/RealTimeSync/Makefile	2019-04-12 07:59:45.008146336 -0400
+++ 10.11-1/FreeFileSync/Source/RealTimeSync/Makefile	2019-04-12 08:29:23.857197105 -0400
@@ -1,10 +1,10 @@
-EXENAME = RealTimeSync_$(shell arch)
+EXENAME = RealTimeSync
 
 CXXFLAGS = -std=c++2a -pipe -DWXINTL_NO_GETTEXT_MACRO -I../../.. -I../../../zenXml -include "zen/i18n.h" -include "zen/warn_static.h" \
            -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`
diff -Naur 10.11-0/FreeFileSync/Source/ui/small_dlgs.cpp 10.11-1/FreeFileSync/Source/ui/small_dlgs.cpp
--- 10.11-0/FreeFileSync/Source/ui/small_dlgs.cpp	2019-04-12 07:59:45.318160616 -0400
+++ 10.11-1/FreeFileSync/Source/ui/small_dlgs.cpp	2019-04-12 08:27:24.421735762 -0400
@@ -115,6 +115,8 @@
         L" x64";
 #endif
 
+    build +=
+        L" for Fedora";
 
     GetSizer()->SetSizeHints(this); //~=Fit() + SetMinSize()