+ && ln -s /opt/yarn/bin/yarn /usr/local/bin/yarn \
+ && ln -s /opt/yarn/bin/yarnpkg /usr/local/bin/yarnpkg \
+ && mkdir -p /tmp/src /opt \
+ && wget -O libiconv.tar.gz "https://ftp.gnu.org/pub/gnu/libiconv/libiconv-$LIBICONV_VERSION.tar.gz" \
+ && echo "$LIBICONV_DOWNLOAD_SHA256 *libiconv.tar.gz" | sha256sum -c - \
+ && tar -xzf libiconv.tar.gz -C /tmp/src \
+ && rm libiconv.tar.gz \
+ && cd /tmp/src/libiconv-$LIBICONV_VERSION \
+ && ./configure --prefix=/usr/local \
+ && make -j$(getconf _NPROCESSORS_ONLN)\
+ && make install \
+ && libtool --finish /usr/local/lib \
+ && cd /mastodon \
+ && rm -rf /tmp/*