Session Manager compiling error

[Nikola Pizurica]

Although I did manage to compile everything else, when compiling session
Manager I get this error:

/usr/src/xfce4/xfce4-session/xfce4-session/manager.c:314: undefined
reference to `xfce_gethostname'
xfce4_session-manager.o(.text+0x11ad): In function `close_connection':
/usr/src/xfce4/xfce4-session/xfce4-session/manager.c:905: undefined
reference to `xfce_strjoin'

What am I doing wrong?

Nikola