Running the pixmap.dem can lead to file not found errors if not called from within the demo folder.
This patch makes it use absolute paths in order to avoid such problems.
This is only suited for OpenIndiana.
--- gnuplot-5.4.1/demo/pixmap.dem.orig	2020-10-13 23:14:48.000000000 +0000
+++ gnuplot-5.4.1/demo/pixmap.dem	2021-05-14 20:00:37.439164468 +0000
@@ -2,9 +2,9 @@
 # Demonstrate use of 'set pixmap' to provide a slide background,
 # a project logo, and a plot element
 #
-set pixmap 1 'gradient.png' at screen 0,0 size screen 1,1 behind
-set pixmap 2 'icon64x64.png' at screen 0.02, 0.02 width screen 0.05 back
-set pixmap 3 'aries.png' at polar 29., 1.11, 0.0 center width char 2.5
+set pixmap 1 '/usr/demo/gnuplot/gradient.png' at screen 0,0 size screen 1,1 behind
+set pixmap 2 '/usr/demo/gnuplot/icon64x64.png' at screen 0.02, 0.02 width screen 0.05 back
+set pixmap 3 '/usr/demo/gnuplot/aries.png' at polar 29., 1.11, 0.0 center width char 2.5
 
 set lmargin 20