diff --git a/.gitignore b/.gitignore
index 8df7ccb2e..1fd0b0c52 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,6 +39,7 @@ build/linux/work/
 build/linux/dist/*.tar.gz
 build/linux/dist/*.tar.bz2
 build/linux/*.tgz
+build/linux/*.tar.xz
 build/linux/*.tar.bz2
 build/linux/*.zip
 build/linux/libastylej*
diff --git a/build/linux/avr-gcc-4.8.1-arduino-i686-pc-linux-gnu.tar.bz2.sha b/build/linux/avr-gcc-4.8.1-arduino-i686-pc-linux-gnu.tar.bz2.sha
deleted file mode 100644
index 98033394a..000000000
--- a/build/linux/avr-gcc-4.8.1-arduino-i686-pc-linux-gnu.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-204f54ff5ef45a53f35fb9b21fcb8ea8edcb385b
diff --git a/build/linux/avr-gcc-4.8.1-arduino1-i686-pc-linux-gnu.tar.bz2.sha b/build/linux/avr-gcc-4.8.1-arduino1-i686-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 000000000..9bc1f7787
--- /dev/null
+++ b/build/linux/avr-gcc-4.8.1-arduino1-i686-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+e61fdb8a21a74d751aa2c152cec9c8d9630c90bb
diff --git a/build/linux/avrdude-6.0.1-arduino-i686-pc-linux-gnu.tar.bz2.sha b/build/linux/avrdude-6.0.1-arduino-i686-pc-linux-gnu.tar.bz2.sha
deleted file mode 100644
index f9b23b14b..000000000
--- a/build/linux/avrdude-6.0.1-arduino-i686-pc-linux-gnu.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-326899e59dec2751d6c49f96fec9680b7a5afe8a
diff --git a/build/linux/avrdude-6.0.1-arduino1-i686-pc-linux-gnu.tar.bz2.sha b/build/linux/avrdude-6.0.1-arduino1-i686-pc-linux-gnu.tar.bz2.sha
new file mode 100644
index 000000000..dc324bc20
--- /dev/null
+++ b/build/linux/avrdude-6.0.1-arduino1-i686-pc-linux-gnu.tar.bz2.sha
@@ -0,0 +1 @@
+ed8856a06a941bc0f605db72926a0318bb483839
diff --git a/build/macosx/avr-gcc-4.8.1-arduino-i386-apple-darwin11.tar.bz2.sha b/build/macosx/avr-gcc-4.8.1-arduino-i386-apple-darwin11.tar.bz2.sha
deleted file mode 100644
index 9ee522767..000000000
--- a/build/macosx/avr-gcc-4.8.1-arduino-i386-apple-darwin11.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-9302d5e6a27eb194cc74e33d0f61f29b2c8d768e
diff --git a/build/macosx/avr-gcc-4.8.1-arduino1-i386-apple-darwin11.tar.bz2.sha b/build/macosx/avr-gcc-4.8.1-arduino1-i386-apple-darwin11.tar.bz2.sha
new file mode 100644
index 000000000..e1ea53c65
--- /dev/null
+++ b/build/macosx/avr-gcc-4.8.1-arduino1-i386-apple-darwin11.tar.bz2.sha
@@ -0,0 +1 @@
+2935ef3e361a9580f6785b97abab001b57f5c5d2
diff --git a/build/macosx/avrdude-6.0.1-arduino-i386-apple-darwin11.tar.bz2.sha b/build/macosx/avrdude-6.0.1-arduino-i386-apple-darwin11.tar.bz2.sha
deleted file mode 100644
index 92d3db319..000000000
--- a/build/macosx/avrdude-6.0.1-arduino-i386-apple-darwin11.tar.bz2.sha
+++ /dev/null
@@ -1 +0,0 @@
-b098ac2cefd32cfec3f4ed626ddb3625864fc04f
diff --git a/build/macosx/avrdude-6.0.1-arduino1-i386-apple-darwin11.tar.bz2.sha b/build/macosx/avrdude-6.0.1-arduino1-i386-apple-darwin11.tar.bz2.sha
new file mode 100644
index 000000000..55254c13a
--- /dev/null
+++ b/build/macosx/avrdude-6.0.1-arduino1-i386-apple-darwin11.tar.bz2.sha
@@ -0,0 +1 @@
+0c6c4935f0889ee30de57c3f589165f084f206f3
diff --git a/build/windows/avr-gcc-4.8.1-arduino-i686-mingw32.zip.sha b/build/windows/avr-gcc-4.8.1-arduino-i686-mingw32.zip.sha
deleted file mode 100644
index b931ef19e..000000000
--- a/build/windows/avr-gcc-4.8.1-arduino-i686-mingw32.zip.sha
+++ /dev/null
@@ -1 +0,0 @@
-3df5d4c783f09c34efc5d70dd3376638dca09de2
diff --git a/build/windows/avr-gcc-4.8.1-arduino1-i686-mingw32.zip.sha b/build/windows/avr-gcc-4.8.1-arduino1-i686-mingw32.zip.sha
new file mode 100644
index 000000000..0afb5ea15
--- /dev/null
+++ b/build/windows/avr-gcc-4.8.1-arduino1-i686-mingw32.zip.sha
@@ -0,0 +1 @@
+c66f8d33cbacb254e0f5867bf4ca87ea79d44839
diff --git a/build/windows/avrdude-6.0.1-arduino-i686-mingw32.zip.sha b/build/windows/avrdude-6.0.1-arduino-i686-mingw32.zip.sha
deleted file mode 100644
index be81ba02f..000000000
--- a/build/windows/avrdude-6.0.1-arduino-i686-mingw32.zip.sha
+++ /dev/null
@@ -1 +0,0 @@
-bb7fcc3aae19f73a79b8e96d093902f7188fb57c
diff --git a/build/windows/avrdude-6.0.1-arduino1-i686-mingw32.zip.sha b/build/windows/avrdude-6.0.1-arduino1-i686-mingw32.zip.sha
new file mode 100644
index 000000000..b374a120c
--- /dev/null
+++ b/build/windows/avrdude-6.0.1-arduino1-i686-mingw32.zip.sha
@@ -0,0 +1 @@
+2c6769c1efe32273042caa89d2a58a0d51384236