Trying to build LO on OS X: problem with make operation

Hello, I am attempting to build LibreOffice on OSX, using the directions for minimal build on the 
Building LibreOffice on OS X web page 
(https://wiki.documentfoundation.org/Development/BuildingOnMac 
<https://wiki.documentfoundation.org/Development/BuildingOnMac>).

I got most of the way through the directions, but when I executed make 2>&1 | tee build.log, the 
make operation did not complete. Here is where it stopped:

cd /Users/ml/lo/core/external/tarballs/tmp && echo fetching boost_1_60_0.tar.bz2 && bash -c 
'/usr/bin/curl -O http://dev-www.libreoffice.org/src/boost_1_60_0.tar.bz2 2>&1 | tee -a 
/Users/ml/lo/core/external/tarballs/fetch.log && [ $PIPESTATUS -eq 0 ]' && SUM=`md5 -r 
boost_1_60_0.tar.bz2 | sed "s/ .*//"` && if test "$SUM" != "65a840e1a0b13a558ff19eeb2c4f0cbe"; then 
echo ERROR: expected checksum for boost_1_60_0.tar.bz2 is 65a840e1a0b13a558ff19eeb2c4f0cbe 2>&1 | 
tee -a /Users/ml/lo/core/external/tarballs/fetch.log; false; fi && mv boost_1_60_0.tar.bz2 ../ 
fetching boost_1_60_0.tar.bz2
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
 66 73.0M   66 48.8M    0     0  38169      0  0:33:25  0:22:22  0:11:03     0curl: (18) transfer 
closed with 25091031 bytes remaining to read
make: *** [/Users/ml/lo/core/workdir/download] Error 1


I  don’t know what Error 1 means or what I’m doing wrong here. Any help appreciated.

Thanks, ML