curl - R travis error: Protocol "https" not supported or disabled in libcurl -

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i'm trying test r package travis , having troubles internal cmake command failing download https. in r package's configure script downloads , cmake's metapackage github. download , install begin fails following error:

scanning dependencies of target hdf5  [  3%] creating directories 'hdf5'  [  3%] performing download step (download, verify , extract) 'hdf5'  -- downloading...  src='https://www.hdfgroup.org/ftp/hdf5/releases/hdf5-1.8.15-patch1/src/hdf5-1.8.15-patch1.tar.bz2'  dst='/tmp/minc-toolkit-v2/build/hdf5-prefix/src/hdf5-1.8.15-patch1.tar.bz2'  timeout='none'  cmake error @ hdf5-prefix/src/hdf5-stamp/download-hdf5.cmake:27 (message):  error: downloading  'https://www.hdfgroup.org/ftp/hdf5/releases/hdf5-1.8.15-patch1/src/hdf5-1.8.15-patch1.tar.bz2'  failed  status_code: 1  status_string: "unsupported protocol"  log: protocol "https" not supported or disabled in libcurl    closing connection -1

prior issue having problems getting more recent version of cmake 2.xx provided travis build machines. .travis.yml looks @ moment:

language: r sudo: require cache: packages addons:   apt:     sources:       - george-edison55-precise-backports # cmake 3.2.3 / doxygen 1.8.3     packages:       - openssl       - libssl-dev       - libcurl4-openssl-dev       - cmake       - cmake-data repos:   biocsoft: http://bioconductor.org/packages/3.2/bioc   cran: https://cran.rstudio.com r_check_args: --install-args="--configure-args=\"--enable-build-minc\""

any ideas on why failing? can access url without issue in browser , things downloaded https urls throughout build process before stage.

newer r versions have https support issue building current r built on ancient ubuntu version travis prescribes.

you try switch ubuntu 12.04 ubuntu 14.04 using

sudo: required  dist: trusty

which in few setups (but use first-generation travis setup quite like, still).


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