plenv throws error while installing

[cowens]

Using the instructions at https://github.com/tokuhirom/plenv, the plenv bash script throws an error in step 4:

$ exec $SHELL -l
/home/cowens/.plenv/bin/plenv: line 15: /dev/fd/62: No such file or directory
plenv: cannot find readlink - are you missing GNU coreutils?
/home/cowens/.plenv/bin/plenv: line 15: type: write error: Broken pipe

This seems to be related to the following code from the script:

read READLINK < <( type -p greadlink readlink )

I can't find a good way to strace a bash command like read (I tried `strace bash -c 'read A < <(echo foo)', but got nothing useful from it).

[cowens]

Hardcoding the path to readlink in plenv lets me get farther, but it errors during compiling in the second part of step 5:

$ plenv install 5.18.0
Installing 5.18.0 as 5.18.0
/usr/bin/perl -- /home/cowens/.plenv/plugins/perl-build/bin/perl-build --symlink-devel-executables --build-dir /home/cowens/.plenv/build/1460040814.2631/ --tarball-dir /home/cowens/.plenv/cache/ -Dusedevel 5.18.0 /home/cowens/.plenv/versions/5.18.0
Fetching 5.18.0 as /home/cowens/.plenv/cache/perl-5.18.0.tar.gz (http://www.cpan.org/authors/id/R/RJ/RJBS/perl-5.18.0.tar.gz)
Downloaded http://www.cpan.org/authors/id/R/RJ/RJBS/perl-5.18.0.tar.gz to /home/cowens/.plenv/cache/perl-5.18.0.tar.gz.
Configuring perl '5.18.0'
rm -f config.sh Policy.sh
Auto-guessed '5.18.0'
patching Configure
File Configure is read-only; trying to patch anyway
/usr/bin/patch: **** Can't rename file Configure to Configure.orig : Invalid argument
Died at /home/cowens/.plenv/plugins/perl-build/bin/perl-build line 69.
ABORT