diff --git a/.travis.yml b/.travis.yml
index 93841e3..7bb9581 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,16 +17,7 @@ cache:
 sudo: false
 
 before_install:
-  - >
-      test -e $HOME/cache/libwebp-${LIBWEBP_VERSION}/lib/libwebp.so || (
-      cd /tmp
-      && wget http://downloads.webmproject.org/releases/webp/libwebp-${LIBWEBP_VERSION}.tar.gz
-      && tar xf libwebp-${LIBWEBP_VERSION}.tar.gz
-      && cd libwebp-${LIBWEBP_VERSION}
-      && ./configure --prefix=$HOME/cache/libwebp-${LIBWEBP_VERSION}
-      && make
-      && make install
-      )
+  - LIBWEBP_PERFIX=$HOME/cache/libwebp-${LIBWEBP_VERSION} && make libwebp
   - cd $HOME/gopath/src/github.com/harukasan/go-libwebp
   - export CGO_CFLAGS="-I $HOME/cache/libwebp-${LIBWEBP_VERSION}/include"
   - export CGO_LDFLAGS="-L $HOME/cache/libwebp-${LIBWEBP_VERSION}/lib"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..697cb72
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,23 @@
+BUILDDIR=/tmp
+WORKDIR=github.com/harukasan/go-libwebp
+
+all: test
+
+test:
+	go test -v ${WORKDIR}/...
+
+libwebp:
+	test -e ${LIBWEBP_PREFIX}/lib/libwebp.so || ( \
+		cd ${BUILDDIR} \
+		&& wget http://downloads.webmproject.org/releases/webp/libwebp-${LIBWEBP_VERSION}.tar.gz \
+		&& tar xf libwebp-${LIBWEBP_VERSION}.tar.gz \
+		&& cd libwebp-${LIBWEBP_VERSION} \
+		&& ./configure --prefix=${LIBWEBP_PREFIX} \
+		&& make \
+		&& make install \
+	)
+
+.PHONY: \
+	all \
+	test
+