I&#39;m writing a multi-stage Dockerfile for the [darshan utils][1]:

    ARG DARSHAN_VER=3.1.6
    
    FROM fedora:29 as build
    RUN dnf install -y \
            gcc \
            make \
            bzip2 bzip2-devel zlib zlib-devel
    RUN curl -O &quot;ftp://ftp.mcs.anl.gov/pub/darshan/releases/darshan-${DARSHAN_VER}.tar.gz&quot; \
        &amp;&amp; tar ...
    
    
    FROM fedora:29
    COPY --from=build &quot;/usr/local/darshan-${DARSHAN_VER}&quot; &quot;/usr/local/darshan-${DARSHAN_VER}&quot;
    ...

I build it with `docker build -t darshan-util:3.6.1 .` and the error I get is:

    Step 5/10 : RUN curl -O &quot;ftp://ftp.mcs.anl.gov/pub/darshan/releases/darshan-${DARSHAN_VER}.tar.gz&quot;     &amp;&amp; tar ...
    
     ---&gt; Running in 9943cce1669c
      % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
    ...
    curl: (78) RETR response: 550
    The command &#39;/bin/sh -c curl -O &quot;ftp://ftp.mcs.anl.gov/pub/darshan/releases/darshan-${DARSHAN_VER}.tar.gz&quot;     &amp;&amp; tar ...&#39; returned a non-zero code: 78


I&#39;d like to reuse the same ARG in both stages, so that I can define a default build variable just once.
If I duplicate ARG in both stages, just below the two FROMs, it builds correctly.

What is the correct way to define a &quot;global&quot; multi-stage ARG variable with a default?

  [1]: https://www.mcs.anl.gov/research/projects/darshan/

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Share variable in multi-stage Dockerfile: ARG before FROM not substituted