https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=899358
Index: weston/weston.ini.in
===================================================================
--- weston.orig/weston.ini.in	2019-03-28 12:55:11.730324981 +0100
+++ weston/weston.ini.in	2019-03-28 12:58:53.029372855 +0100
@@ -38,7 +38,7 @@
 
 [launcher]
 icon=/usr/share/icons/gnome/24x24/apps/arts.png
-path=@abs_top_builddir@/weston-flower
+path=@libexecdir@/weston-flower
 
 [input-method]
 path=@libexecdir@/weston-keyboard