=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Checksum SHA1 OK for R/curl_4.0.tar.gz
=> Checksum RMD160 OK for R/curl_4.0.tar.gz
=> Checksum SHA512 OK for R/curl_4.0.tar.gz
===> Installing dependencies for R-curl-4.0nb1
==========================================================================
The following variables will affect the build process of this package,
R-curl-4.0nb1.  Their current value is shown below:

        * KRB5_DEFAULT = heimdal
        * SSLBASE = /usr
        * SSLCERTS = /etc/openssl/certs
        * SSLDIR = /etc/openssl
        * SSLKEYS = /etc/openssl/private

Based on these variables, the following variables have been set:

        * KRB5BASE (defined, but empty)
        * KRB5_TYPE = heimdal

You may want to abort the process now with CTRL-C and change their value
before continuing.  Be sure to run `/usr/bin/make clean' after
the changes.
==========================================================================
=> Tool dependency pkgconf-[0-9]*: found pkgconf-1.6.0
=> Build dependency cwrappers>=20150314: found cwrappers-20180325
=> Full dependency R>=2.2.1nb2: found R-3.6.1nb1
=> Full dependency curl>=7.65.3nb3: found curl-7.66.0nb1
===> Overriding tools for R-curl-4.0nb1
===> Extracting for R-curl-4.0nb1
===> Patching for R-curl-4.0nb1
===> Creating toolchain wrappers for R-curl-4.0nb1
===> Configuring for R-curl-4.0nb1
=> Generating pkg-config files for builtin xz package.