/usr/share/lout/include/picturef is in lout-common 3.39-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | ###########################################################################
#                                                                         #
#  @IllustrationSetup extension to @DocumentSetup.                        #
#                                                                         #
#  Jeffrey H. Kingston                                                    #
#                                                                         #
#  This package extends DocumentSetup for illustrations.                  #
#                                                                         #
#  This program is free software; you can redistribute it and/or modify   #
#  it under the terms of the GNU General Public License as published by   #
#  the Free Software Foundation; either Version 3, or (at your option)    #
#  any later version.                                                     #
#                                                                         #
#  This program 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 General Public License for more details.                           #
#                                                                         #
#  You should have received a copy of the GNU General Public License      #
#  along with this program; if not, write to the Free Software            #
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston MA 02111-1307 USA #
#                                                                         #
#  As a special exception, when this file is read by Lout when processing #
#  a Lout source document, you may use the result without restriction.    #
#                                                                         #
###########################################################################
extend @BasicSetup @DocumentSetup
export @Illustration
def @IllustrationSetup
@Begin
    #######################################################################
    #                                                                     #
    #  @Illustration                                                      #
    #                                                                     #
    #######################################################################
    def @Illustration
	named @InitialFont { @InitialFont }
	named @InitialBreak { @InitialBreak }
	named @InitialOutdent { @InitialOutdent }
	named @InitialSpace { @InitialSpace }
	named @InitialLanguage { @InitialLanguage }
	named @InitialColour { @InitialColour }
	right x
    {
        @InitialFont @Font { @InitialBreak setoutdent @InitialOutdent } @Break
	@InitialLanguage @Language @InitialSpace @Space
	{ @ColourCommand @InitialColour } @SetColour
	@OneCol @OneRow x
    }
@End @IllustrationSetup
 |