--- Makefile	2014-01-22 13:41:18.446199844 +0100
+++ Makefile.new	2014-01-22 13:42:36.395089461 +0100
@@ -28,7 +28,7 @@
 oldincludedir = /usr/include
 mandir = ${prefix}/share/man
 compdir = $(shell pkg-config --variable=completionsdir bash-completion)
-compdir := $(or $(compdir), "/etc/bash_completion.d")
+compdir := $(or ${prefix}/../$(compdir), "${sysconfdir}/bash_completion.d")
 
 pkgdatadir = $(datadir)/$(PKGNAME)
 pkglibdir = $(libdir)/$(PKGNAME)