diff --git a/.travis.yml b/.travis.yml
index d80fc05c7b2937da85598f5a4bbd271d80fddf1a..a7af672506570a55e9b7ed909afeba5a9997889f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,12 +8,13 @@ addons:
       - ubuntu-toolchain-r-test
       - llvm-toolchain-trusty-4.0
     packages:
+      - llvm-4.0-dev
       - clang++-4.0
       - g++-6
 before_install:
   - mkdir ext
   - git clone --recursive --depth=1 --single-branch --branch boost-1.64.0 git://github.com/boostorg/boost ext/boost
-  - "cd ext/boost && ./bootstrap.sh --prefix=$TRAVIS_BUILD_DIR/ext && ./b2 -d0 headers && echo 'using clang : 4.0 : clang++-4.0 ;' >> project-config.jam && ./b2 -d0 -j4 --with-thread --with-date_time --with-system --with-filesystem --with-program_options --with-signals --with-serialization --with-chrono --with-test --with-context --with-locale --with-coroutine toolset=clang install"
+  - "cd ext/boost && ./bootstrap.sh --prefix=$TRAVIS_BUILD_DIR/ext && ./b2 -d0 headers && echo 'using clang : 4.0 : clang++-4.0 ;' >> project-config.jam && ./b2 -d0 -j4 --with-thread --with-date_time --with-system --with-filesystem --with-program_options --with-signals --with-serialization --with-chrono --with-test --with-context --with-locale --with-coroutine toolset=clang link=static install"
   - cd $TRAVIS_BUILD_DIR/ext && git clone --depth=1 --single-branch git://github.com/cryptonomex/secp256k1-zkp
   - cd secp256k1-zkp && ./autogen.sh && ./configure --prefix=$TRAVIS_BUILD_DIR/ext CC=clang-4.0 CXX=clang++-4.0 && make && make install
   - cd $TRAVIS_BUILD_DIR/ext && wget https://cmake.org/files/v3.9/cmake-3.9.0-Linux-x86_64.tar.gz && tar xzf cmake-3.9.0-Linux-x86_64.tar.gz