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Installation of DMSF fails because of following error:

Installing simple_enum 2.3.2
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /usr/local/bundle/gems/ox-2.14.0/ext/ox
/usr/local/bin/ruby -I /usr/local/lib/ruby/2.6.0 -r
./siteconf20201216-24-10lvdti.rb extconf.rb
>>>>> Creating Makefile for ruby version 2.6.6 on x86_64-linux <<<<<
checking for rb_time_timespec()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/usr/local/bin/$(RUBY_BASE_NAME)
    --with-ox-dir
    --without-ox-dir
    --with-ox-include
    --without-ox-include=${ox-dir}/include
    --with-ox-lib
    --without-ox-lib=${ox-dir}/lib