diff -up gnuplot-5.2.4/demo/circles.dem.nolena gnuplot-5.2.4/demo/circles.dem
--- gnuplot-5.2.4/demo/circles.dem.nolena	2017-12-22 18:32:30.000000000 +0100
+++ gnuplot-5.2.4/demo/circles.dem	2018-08-08 10:14:21.308379527 +0200
@@ -98,21 +98,6 @@ pause -1 "Hit return to continue"
 
 reset
 set size ratio -1
-set title "Lena's key points"
-unset xtics
-unset ytics
-unset key
-unset border
-set yrange [] reverse
-
-plot 'lena.rgb' binary array=(128,128) dx=4 dy=4 format='%uchar' with rgbimage, \
-     'lena-keypoints.bin' binary format='%double' with circles lc rgb "yellow"
-
-pause -1 "Hit return to continue"
-
-
-reset
-set size ratio -1
 set title "Delaunay triangulation of Hemisphere points, some empty circles in red"
 unset key
 
diff -up gnuplot-5.2.4/demo/Makefile.am.nolena gnuplot-5.2.4/demo/Makefile.am
--- gnuplot-5.2.4/demo/Makefile.am.nolena	2017-12-23 07:29:12.000000000 +0100
+++ gnuplot-5.2.4/demo/Makefile.am	2018-08-08 10:18:08.787797877 +0200
@@ -68,7 +68,7 @@ epslatex:
 	dvips epslatex
 
 ##m4-files-begin
-EXTRA_DIST = Makefile.am.in lena-keypoints.bin scatter2.bin sine.bin \
+EXTRA_DIST = Makefile.am.in scatter2.bin sine.bin \
 using.bin gnuplot.cfg world.cor 1.dat 2.dat 3.dat arrowstyle.dat \
 asciimat.dat battery.dat big_peak.dat candlesticks.dat cities.dat \
 clip14in.dat ctg-y2.dat delaunay-edges.dat ellipses.dat empty-circles.dat \
@@ -107,7 +107,7 @@ textrotate.dem tics.dem timedat.dem tran
 ttics.dem using.dem utf8.dem varcolor.dem vector.dem violinplot.dem \
 volatile.dem world2.dem world.dem zerror.dem demo.edf density.fnc \
 hexa.fnc line.fnc reflect.fnc gen-random.inc stat.inc GM1_sugar.pdb \
-bldg.png GM1_bonds.r3d blutux.rgb lena.rgb sound.par sound2.par start.par \
+bldg.png GM1_bonds.r3d blutux.rgb sound.par sound2.par start.par \
 gnuplot.rot gnu-valley random-points gpdemos.tcl html 
 ##m4-files-end
 
diff -up gnuplot-5.2.4/demo/Makefile.in.nolena gnuplot-5.2.4/demo/Makefile.in
--- gnuplot-5.2.4/demo/Makefile.in.nolena	2018-06-01 03:51:13.000000000 +0200
+++ gnuplot-5.2.4/demo/Makefile.in	2018-08-08 10:18:14.455683660 +0200
@@ -330,7 +330,7 @@ SUBDIRS = $(PLUGIN_DIR)
 DIST_SUBDIRS = plugin
 DEMO = all.dem
 GNUPLOT = gnuplot
-EXTRA_DIST = Makefile.am.in lena-keypoints.bin scatter2.bin sine.bin \
+EXTRA_DIST = Makefile.am.in scatter2.bin sine.bin \
 using.bin gnuplot.cfg world.cor 1.dat 2.dat 3.dat arrowstyle.dat \
 asciimat.dat battery.dat big_peak.dat candlesticks.dat cities.dat \
 clip14in.dat ctg-y2.dat delaunay-edges.dat ellipses.dat empty-circles.dat \
@@ -369,7 +369,7 @@ textrotate.dem tics.dem timedat.dem tran
 ttics.dem using.dem utf8.dem varcolor.dem vector.dem violinplot.dem \
 volatile.dem world2.dem world.dem zerror.dem demo.edf density.fnc \
 hexa.fnc line.fnc reflect.fnc gen-random.inc stat.inc GM1_sugar.pdb \
-bldg.png GM1_bonds.r3d blutux.rgb lena.rgb sound.par sound2.par start.par \
+bldg.png GM1_bonds.r3d blutux.rgb sound.par sound2.par start.par \
 gnuplot.rot gnu-valley random-points gpdemos.tcl html 
 
 @BUILD_PLUGIN_TRUE@PLUGIN_DIR = plugin
diff -up gnuplot-5.2.4/demo/rgbalpha.dem.nolena gnuplot-5.2.4/demo/rgbalpha.dem
--- gnuplot-5.2.4/demo/rgbalpha.dem.nolena	2017-12-22 18:32:30.000000000 +0100
+++ gnuplot-5.2.4/demo/rgbalpha.dem	2018-08-08 10:14:21.309379507 +0200
@@ -18,8 +18,8 @@ set yrange [ 0. : 128. ]
 # Alpha =  linear gradient on x
 
 plot 100.*(.4+sin(x/5.)/(x/5.)) lw 5 title 'solid line', \
-     'lena.rgb' binary array=(128,128) format="%uchar" flipy using 1:2:3:(2.*column(0)) \
-                with rgbalpha title "Lena with linear\nalpha gradient"
+     'blutux.rgb' binary array=(128,128) format="%uchar" flipy using 1:2:3:(2.*column(0)) \
+                with rgbalpha title "Tux with linear\nalpha gradient"
 
 pause -1 "Hit return to continue"
 
@@ -28,8 +28,8 @@ pause -1 "Hit return to continue"
 focus(x,y) = ((column(0)-x)**2 + (column(-1)-(127-y))**2) > 400 ? 0 : 255
 
 plot 100.*(.4+sin(x/5.)/(x/5.)) lw 5 title 'solid line', \
-     'lena.rgb' binary array=(128,128) format="%uchar" flipy using 1:2:3:(focus(70,50)) \
-                with rgbalpha title "Lena with circular mask"
+     'blutux.rgb' binary array=(128,128) format="%uchar" flipy using 1:2:3:(focus(70,50)) \
+                with rgbalpha title "Tux with circular mask"
 
 pause -1 "Hit return to continue"
 reset