Finally got the solution to recompile #ruby < 2.4 with #rvm reinstall ruby-version on archlinux after the openssl-1.1 upgrade. The solution is here: https://bbs.archlinux.org/viewtopic.php?pid=1708836
You just have to export these thing before entering your rvm (re)install commands:
$ export CFLAGS="$CFLAGS -I/usr/include/openssl-1.0"
$ export LDFLAGS="$LDFLAGS -L/usr/lib/openssl-1.0 -lssl"
$ rvm reinstall ruby-2.1.2
$ bundle install (if needed)
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