only use the specific build matrix

use sudo to install mingw toolchains

.travis.yml

@@ -1,14 +1,4 @@
 language: c
-compiler:
-        - clang
-        - gcc
-os:
-        - linux
-        - osx
-env:
-        - ARCH=native
-        - ARCH=mingw32
-        - ARCH=mingw64
 matrix:
         include:
                 - compiler: clang

scripts/travis

@@ -16,9 +16,11 @@ else
 
 	if [ -z $(which $CC) ]; then
 		# Update Ubuntu 12.04 with current mingw toolchain
-		apt-get update && apt-get install -y python-software-properties
-		apt-add-repository -y ppa:tobydox/mingw-x-precise
-		apt-get update && apt-get install -y $ARCH-x-gcc make
+		sudo apt-get update
+		sudo apt-get install -y python-software-properties
+		sudo apt-add-repository -y ppa:tobydox/mingw-x-precise
+		sudo apt-get update
+		sudo apt-get install -y $ARCH-x-gcc make
 		export PATH=$PATH:/opt/$ARCH/bin
 	fi