diff --git a/arduino-core/src/cc/arduino/Compiler.java b/arduino-core/src/cc/arduino/Compiler.java
index adef1ccde..b1c4176be 100644
--- a/arduino-core/src/cc/arduino/Compiler.java
+++ b/arduino-core/src/cc/arduino/Compiler.java
@@ -70,7 +70,7 @@ public class Compiler implements MessageConsumer {
     tr("Multiple libraries were found for \"{0}\"");
     tr(" Not used: {0}");
     tr(" Used: {0}");
-    tr("Library can't use both 'src' and 'utility' folders.");
+    tr("Library can't use both 'src' and 'utility' folders. Double ckeck {0}");
     tr("WARNING: library {0} claims to run on {1} architecture(s) and may be incompatible with your current board which runs on {2} architecture(s).");
     tr("Looking for recipes like {0}*{1}");
     tr("Board {0}:{1}:{2} doesn''t define a ''build.board'' preference. Auto-set to: {3}");
diff --git a/build/arduino-builder-linux32-1.2.0.tar.bz2.sha b/build/arduino-builder-linux32-1.2.0.tar.bz2.sha
deleted file mode 100644
index 3fb1458be..000000000
--- a/build/arduino-builder-linux32-1.2.0.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-f915a2e926d644a3f64155e45335926df9285875
diff --git a/build/arduino-builder-linux32-1.2.1.tar.bz2.sha b/build/arduino-builder-linux32-1.2.1.tar.bz2.sha
new file mode 100644
index 000000000..a2b0eb0af
--- /dev/null
+++ b/build/arduino-builder-linux32-1.2.1.tar.bz2.sha
@@ -0,0 +1 @@
+db7ab6808581289b15f91f5ad252d8d952c09fe6
diff --git a/build/arduino-builder-linux64-1.2.0.tar.bz2.sha b/build/arduino-builder-linux64-1.2.0.tar.bz2.sha
deleted file mode 100644
index 9fbda4b55..000000000
--- a/build/arduino-builder-linux64-1.2.0.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-babdeb6c2718be755137b2084491ba483a67e20e
diff --git a/build/arduino-builder-linux64-1.2.1.tar.bz2.sha b/build/arduino-builder-linux64-1.2.1.tar.bz2.sha
new file mode 100644
index 000000000..727336827
--- /dev/null
+++ b/build/arduino-builder-linux64-1.2.1.tar.bz2.sha
@@ -0,0 +1 @@
+1c817cddd29f9483c29ae0875614579e34ec5ae9
diff --git a/build/arduino-builder-macosx-1.2.0.tar.bz2.sha b/build/arduino-builder-macosx-1.2.0.tar.bz2.sha
deleted file mode 100644
index 0acdcd961..000000000
--- a/build/arduino-builder-macosx-1.2.0.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-13f1137c3ef3d6ef7649ac4b0cda49f49fc59fe5
diff --git a/build/arduino-builder-macosx-1.2.1.tar.bz2.sha b/build/arduino-builder-macosx-1.2.1.tar.bz2.sha
new file mode 100644
index 000000000..ec2a755b5
--- /dev/null
+++ b/build/arduino-builder-macosx-1.2.1.tar.bz2.sha
@@ -0,0 +1 @@
+5b29db86baf6751d5e46f05a242c809be5c318b2
diff --git a/build/arduino-builder-windows-1.2.0.zip.sha b/build/arduino-builder-windows-1.2.0.zip.sha
deleted file mode 100644
index 8d641a372..000000000
--- a/build/arduino-builder-windows-1.2.0.zip.sha
+++ /dev/null
@@ -1 +0,0 @@
-e2892e06a5a319e21f58340a6f435bf45d3480b0
diff --git a/build/arduino-builder-windows-1.2.1.zip.sha b/build/arduino-builder-windows-1.2.1.zip.sha
new file mode 100644
index 000000000..d732c5196
--- /dev/null
+++ b/build/arduino-builder-windows-1.2.1.zip.sha
@@ -0,0 +1 @@
+3a0c9ac072f18c0cd04ec9027f2860faad4d736a
diff --git a/build/build.xml b/build/build.xml
index b2b53bc87..9943c77ff 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -71,7 +71,7 @@
     </or>
   </condition>
 
-  <property name="ARDUINO-BUILDER-VERSION" value="1.2.0" />
+  <property name="ARDUINO-BUILDER-VERSION" value="1.2.1" />
 
   <!-- Libraries required for running arduino -->
   <fileset dir=".." id="runtime.jars">