diff -up Arduino-1.6.4/build/build.xml.mod Arduino-1.6.4/build/build.xml
--- Arduino-1.6.4/build/build.xml.mod	2016-03-13 16:09:04.478986047 -0700
+++ Arduino-1.6.4/build/build.xml	2016-03-13 16:09:13.389887933 -0700
@@ -14,7 +14,7 @@
   <condition property="platform" value="macosx"><os family="mac" /></condition>
   <condition property="platform" value="windows"><os family="windows" /></condition>
   <condition property="platform" value="linux32"><os family="unix" arch="i386" /></condition>
-  <condition property="platform" value="linux64"><os family="unix" arch="amd64" /></condition>
+  <condition property="platform" value="linux64"><os family="unix" /></condition>
 
   <condition property="macosx"><equals arg1="${platform}" arg2="macosx-old" /></condition>
   <condition property="macosx"><equals arg1="${platform}" arg2="macosx" /></condition>