/usr/share/gretl/gtksourceview/darkslate.xml is in gretl-common 2017d-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
 Copyright (C) 2007 Gustavo J. A. M. Carneiro
 Copyright (C) 2007 GtkSourceView team
 Author: Paolo Maggi <paolo@gnome.org>
         Paolo Borelli <pborelli@gnome.org>
         Gustavo Carneiro <gjc@gnome.org>
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Library General Public
 License as published by the Free Software Foundation; either
 version 2 of the License, or (at your option) any later version.
 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Library General Public License for more details.
 You should have received a copy of the GNU Library General Public
 License along with this library; if not, write to the
 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.
-->
<style-scheme id="darkslate" _name="Emacs Dark" version="1.0">
  <author>Gustavo Carneiro</author>
  <_description>Dark color scheme, based on GNU Emacs, but with some modifications.</_description>
  <color name="DarkSlateGray" value="#2F4F4F"/>
  <color name="Wheat" value="#F5DEB3"/>
  <color name="DarkBlue" value="#00008B"/>
  <color name="Orchid" value="#DA70D6"/>
  <!-- Global Settings -->
  <style name="text" foreground="Wheat" background="DarkSlateGray"/>
  <style name="selection" background="DarkBlue"/>
  <style name="cursor" foreground="Orchid"/>
  <style name="current-line" background="#506050"/>
  <style name="line-numbers" foreground="#grey" background="#black"/>
  <!-- Bracket Matching -->
  <style name="bracket-match" background="#247824" bold="true"/>
  <style name="bracket-mismatch" background="#8f4f4f" bold="true"/>
  <!-- Comments -->
  <style name="def:comment" foreground="#grey"/>
  <style name="def:sheband" foreground="#grey" bold="true"/>
  <style name="def:doc-comment-element" italic="true"/>
  <!-- Constants -->
  <style name="def:constant" foreground="#Aquamarine"/>
  <style name="def:string" foreground="#LightSalmon"/>
  <style name="def:special-char" foreground="#white"/>
  <style name="def:special-constant" foreground="#Aquamarine"/>
  <style name="def:floating-point" foreground="#Aquamarine"/>
  <!-- Identifiers -->
  <style name="def:identifier" foreground="#LightGoldenrod"/>
  <!-- Statements -->
  <style name="def:statement" foreground="#Cyan" bold="true"/>
  <!-- Types -->
  <style name="def:type" foreground="#PaleGreen"/> 
  <!-- Others -->
  <style name="def:preprocessor" foreground="#CornFlowerBlue"/>
  <style name="def:error" foreground="#yellow" background="#red" bold="true"/>
<!--  <style name="def:note"                    background="butter1" foreground="aluminium4" bold="true"/> -->
<!--  <style name="def:underlined"              italic="true" underline="true"/> -->
 
</style-scheme>
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