try removing nmatrix

Author: 0xdevalias

Gemfile

@@ -11,7 +11,7 @@ gem 'jekyll','~>4.1.0'
 #   https://github.com/0xdevalias/devalias.net/issues/83
 #   https://github.com/jekyll/classifier-reborn/issues/192
 #   https://github.com/SciRuby/rb-gsl/issues/63
-gem 'nmatrix'
+#gem 'nmatrix'
 gem 'gsl' # Note: you need to install a compatible version (eg. 2.1) of gsl first: brew install gsl@2.1
 gem 'classifier-reborn'
 

Gemfile.lock

@@ -3,7 +3,6 @@ GEM
   specs:
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
-    backports (3.18.1)
     classifier-reborn (2.2.0)
       fast-stemmer (~> 1.0)
     colorator (1.1.0)
@@ -78,13 +77,9 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
     multipart-post (2.1.1)
-    nmatrix (0.2.4)
-      packable (~> 1.3, >= 1.3.5)
     octokit (4.18.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
-    packable (1.3.14)
-      backports
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.5)
@@ -126,7 +121,6 @@ DEPENDENCIES
   jekyll-time-to-read
   jekyll-twitter-plugin
   jekyll_version_plugin
-  nmatrix
 
 BUNDLED WITH
    2.1.4