+ rm -f boost.log
+
+ pushd boost
+ echo "Checking out boost v${BOOST_VERSION}..."
+ git checkout --force -B boost-${BOOST_VERSION} tags/boost-${BOOST_VERSION} &>> ../boost.log
+ git submodule foreach --recursive git checkout --force -B boost-${BOOST_VERSION} tags/boost-${BOOST_VERSION} &>> ../boost.log
+ echo "Reset and clean all modular repositories..."
+ git reset --hard HEAD >> ../boost.log
+ git clean -d --force >> ../boost.log
+ git clean -d --force -x >> ../boost.log
+ git submodule foreach --recursive git reset --hard HEAD >> ../boost.log
+ git submodule foreach --recursive git clean --force -d >> ../boost.log
+ git submodule foreach --recursive git clean --force -d -x >> ../boost.log
+ echo "Copying user configs to boost..."
+ cp ${EXTDIR}/../resource/patches/boost/${TOOLSET}/user-config.jam tools/build/src/user-config.jam
+ echo "Boostrapping boost..."
+ ./bootstrap.sh
+ echo "Building..."