diff -up plasma-desktop-5.4.1/kcms/kfontinst/config-fontinst.h.cmake.kauth_helper plasma-desktop-5.4.1/kcms/kfontinst/config-fontinst.h.cmake
--- plasma-desktop-5.4.1/kcms/kfontinst/config-fontinst.h.cmake.kauth_helper	2015-09-03 05:48:44.000000000 -0500
+++ plasma-desktop-5.4.1/kcms/kfontinst/config-fontinst.h.cmake	2015-09-28 18:38:00.560763031 -0500
@@ -1,7 +1,7 @@
 #ifndef __CONFIG_FONTINST_H__
 #define __CONFIG_FONTINST_H__
 
-#define KFONTINST_LIB_EXEC_DIR "${CMAKE_INSTALL_PREFIX}/${KAUTH_HELPER_INSTALL_DIR}"
+#define KFONTINST_LIB_EXEC_DIR "${KAUTH_HELPER_INSTALL_ABSOLUTE_DIR}"
 
 /* Define to 1 if you have the <locale.h> header file. */
 #cmakedefine HAVE_LOCALE_H 1
diff -up plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.service.cmake.kauth_helper plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.service.cmake
--- plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.service.cmake.kauth_helper	2015-09-03 05:48:44.000000000 -0500
+++ plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.service.cmake	2015-09-28 18:39:12.058195439 -0500
@@ -1,4 +1,4 @@
 [D-BUS Service]
 Name=org.kde.fontinst
-Exec=@CMAKE_INSTALL_PREFIX@/@KAUTH_HELPER_INSTALL_DIR@/fontinst
+Exec=@KAUTH_HELPER_INSTALL_ABSOLUTE_DIR@/fontinst
 
diff -up plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.system-service.cmake.kauth_helper plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.system-service.cmake
--- plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.system-service.cmake.kauth_helper	2015-09-03 05:48:44.000000000 -0500
+++ plasma-desktop-5.4.1/kcms/kfontinst/dbus/org.kde.fontinst.system-service.cmake	2015-09-28 18:41:09.250906989 -0500
@@ -1,5 +1,5 @@
 [D-BUS Service]
 Name=org.kde.fontinst
-Exec=@CMAKE_INSTALL_PREFIX@/@KAUTH_HELPER_INSTALL_DIR@/fontinst
+Exec=@KAUTH_HELPER_INSTALL_ABSOLUTE_DIR@/fontinst
 User=root