Problem building F-spot as a new test user

["Dotan Cohen" <dotancohen gmail com>]

I added the JobScheduler patch, and tried to build, and got this at make:
sh-3.1$ make && echo "Successful"
make  all-recursive
make[1]: Entering directory `/home/test/development/f-spot/f-spot'
Making all in FlickrNet
make[2]: Entering directory `/home/test/development/f-spot/f-spot/FlickrNet'
gmcs -r:System.Web.dll -out:FlickrNet.dll /target:library
./AssemblyInfo.cs    ./Auth.cs        ./Blogs.cs      ./Cache.cs
./Categories.cs         ./Contacts.cs   ./Context.cs
./DateGranularity.cs    ./ExifPhoto.cs  ./Flickr.cs
./FlickrConfigurationManager.cs  ./FlickrConfigurationSettings.cs
./FlickrException.cs    ./Groups.cs     ./Licenses.cs
./OnlineUsers.cs        ./Person.cs     ./PhotoCounts.cs
./PhotoInfo.cs  ./Photos.cs     ./PhotoSearchOptions.cs
./PhotoSets.cs  ./Response.cs   ./Sizes.cs      ./Uploader.cs
./UploadProgressEvent.cs         ./User.cs       ./Utils.cs
make[2]: gmcs: Command not found
make[2]: *** [FlickrNet.dll] Error 127
make[2]: Leaving directory `/home/test/development/f-spot/f-spot/FlickrNet'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/test/development/f-spot/f-spot'
make: *** [all-recursive-am] Error 2
sh-3.1$

And ideas why? I added the second user from "kuser", and I see that
there are other differences between this test user and my regular
user. For instance, when trying to launch GUI apps from Konsole it
fails:

dotancohen ubuntu:~$ su - test
Password:
test ubuntu:~$ kate
kate: cannot connect to X server
test ubuntu:~$ gedit
cannot open display: (null)
Run 'gedit --help' to see a full list of available command line options.
test ubuntu:~$ firefox

(firefox-bin:6389): Gtk-WARNING **: cannot open display:
test ubuntu:~$

What should I do? Thanks.

Dotan Cohen
http://lyricslist.com