### Debian native
true \
  && PKGS_TO_ADD="curl ca-certificates gcc libc6-dev make" \
  && SUDO=sudo \
  && PKGINIT="$SUDO apt update" \
  && PKGADD="$SUDO apt install -y --no-install-recommends" \
  && PKGCLEAN="$SUDO apt clean" \
  && HOST= \
  && true


### Alpine mingw cross
true \
  && PKGS_TO_ADD="curl make mingw-w64-gcc tar" \
  && SUDO="/home/$USER/.local/bin/sudo" \
  && PKGINIT=true \
  && PKGADD="$SUDO apk add" \
  && PKGCLEAN="$SUDO apk clean" \
  && HOST=x86_64-w64-mingw32 \
  && true


## Generic
true \
  && ZLIB_VERSION="1.2.11" \
  && CACHE_DIR="/var/tmp" \
  && true


## Make
true \
  && ZLIB_URL="https://downloads.sourceforge.net/project/libpng/zlib/${ZLIB_VERSION:?}/zlib-${ZLIB_VERSION:?}.tar.gz" \
  && ZLIB_SRCTGZ="${CACHE_DIR:?}/zlib-${ZLIB_VERSION:?}.tgz" \
  && ZLIB_BINTGZ="${ZLIB_SRCTGZ%.*}-bin.tgz" \
  && if test -n "$HOST"; then HOST_="${HOST:?}-" ;fi \
  && if test ! -e "${ZLIB_SRCTGZ:?}"; then (true \
     && echo "Download \"${ZLIB_URL:?}\"" \
     && curl -sSLo "${ZLIB_SRCTGZ:?}" "${ZLIB_URL:?}" \
     );fi \
  && if test ! -e "${ZLIB_BINTGZ:?}"; then (true \
     && printf '\n  Build zlib\n\n' \
     && tar xzf "${ZLIB_SRCTGZ:?}" \
     && cd "zlib-${ZLIB_VERSION:?}" \
     && mkdir build \
     && if echo $HOST|grep -q '\-mingw'; then true \
        && export DESTDIR=./build BINARY_PATH=/bin INCLUDE_PATH=/include LIBRARY_PATH=/lib \
        && sed -i "s;^PREFIX =.\*\$;;" win32/Makefile.gcc \
        && make -j$(nproc) -fwin32/Makefile.gcc PREFIX=${HOST_:?} \
        && make -fwin32/Makefile.gcc install PREFIX=${HOST_:?} \
        && unset DESTDIR BINARY_PATH INCLUDE_PATH LIBRARY_PATH \
        ;else true \
        && ./configure --prefix=$PWD/build \
        && make -j$(nproc) && make install \
        ;fi \
     && cp README build/. \
     && (cd build \
        && rm -rf lib/pkgconfig \
        && tar --owner=0 --group=0 -czf "${ZLIB_BINTGZ:?}" * \
        && md5sum -b "${ZLIB_BINTGZ:?}" > "${ZLIB_BINTGZ:?}.md5" \
        ) \
     && cd .. && rm -rf "zlib-${ZLIB_VERSION:?}" \
     );fi \
  && printf '\n  DONE\n\n'


## Install
true \
  && $SUDO tar -C "${INSTALL_ROOT:?}" -xzf "${ZLIB_BINTGZ:?}" \
  && true