[f-spot] Disable out-of-prefix by default install of RetroactiveRoll.

[Ruben Vermeersch <rubenv src gnome org>]

commit 3a7328d19013517f2425ce941e43657a37b98698
Author: Ruben Vermeersch <ruben savanne be>
Date:   Tue May 11 18:56:56 2010 +0200

    Disable out-of-prefix by default install of RetroactiveRoll.
    
    It's impossible to develop it without breaking your installed system
    with this.

 extensions/Tools/RetroactiveRoll/Makefile |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/extensions/Tools/RetroactiveRoll/Makefile b/extensions/Tools/RetroactiveRoll/Makefile
index 0247a92..6befb52 100644
--- a/extensions/Tools/RetroactiveRoll/Makefile
+++ b/extensions/Tools/RetroactiveRoll/Makefile
@@ -12,7 +12,10 @@ RESOURCES = \
 SOURCES = \
 	RetroactiveRoll.cs
 
-install: all
+install:
+	@echo "Run make force-install to install"
+
+force-install: all
 	cp *.dll ~/.config/f-spot/addins/
 
 mpack: RetroactiveRoll.dll