FROM alpine:3.7

COPY CRF++-0.58.tar.gz .
RUN set -ex; \
  \
  apk add --no-cache --virtual .build-deps \
    gcc \
    g++ \
    make \
		musl-dev \
  ; \
  \
  mkdir -p /usr/src/crfpp; \
  tar -xzf CRF++-0.58.tar.gz -C /usr/src/crfpp --strip-components=1; \
  rm CRF++-0.58.tar.gz; \
  \
  cd /usr/src/crfpp; \
  ./configure; \
  make -j "$(nproc)"; \
  make install; \
  \
  rm -r /usr/src/crfpp; \
  \
  apk del .build-deps