how to start xfce4.8 desktop environment

[janu mam]

hi i idid lfs-6.7 and i am following blfs-svn:
http://www.linuxfromscratch.org/blfs/view/svn/x/introduction.html
i have installed Fluxbox-1.1.1 as windows manager

now i want xfce4.8 as desktop environment
i installed all packages as order mentioned here
http://www.xfce.org/download/building
[note:i am not using git]

i just taking each package and unter,cd into extracted dir and
[example:
 root [ ~ ]# cd /home/janu/Downloads/xc]#tar -jxf xfce-4.8.tar.bz2
root [ ~ ]# cd /home/janu/Downloads/xc/]#cd src/
root [ ~ ]# cd /home/janu/Downloads/xc/src/ here untar each package and then
./configure --prefix=/usr && make && make install

i installed all packages and its dependencies except xfwm4
 NOTE:the xfconf package provides libxfconf, xfconf-query and xfconfd.

  so xfwm4 one of dependency is :libxfconf
so i reinstalled xfconf[third package] again ,still xfwm4 giving errors
xfwm4-4.8.0 errors:
root [ /home/janu/Downloads/xc/src/xfwm4-4.8.0 ]# ./configure
--prefix=/usr && make && make install
/usr/lib/libgdk-x11-2.0.so: undefined reference to `XRRFreeOutputInfo'
/usr/lib/libgdk-x11-2.0.so: undefined reference to `XRRFreeScreenResources'
/usr/lib/libgdk-x11-2.0.so: undefined reference to `XRRGetOutputPrimary'
/usr/lib/libgdk-x11-2.0.so: undefined reference to `XRRFreeCrtcInfo'
/usr/lib/libgdk-x11-2.0.so: undefined reference to `XRRGetCrtcInfo'
collect2: ld returned 1 exit status
make[2]: *** [xfwm4] Error 1
make[2]: Leaving directory `/home/janu/Downloads/xc/src/xfwm4-4.8.0/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/janu/Downloads/xc/src/xfwm4-4.8.0'
make: *** [all] Error 2

  i think xfwm/xfwm4 is window manager[note:if xfwm/xfwm4 is same like
  fluxbox-i can skip this xfwm installation part right??.]
  i have already installed Fluxbox-1.1.1 as window manager
  i think almost i done xfce desktop environment
  to start xfce i need to change/add some thing to .xinitrc file right?
  my xinitrc file:
  root [ ~ ]# cat .xinitrc
  startfluxbox

shall i add below things to xinitrc to start xfce desktop environment:

  echo startxfce4 > ~/.xinitrc
  echo xfce4-session > ~/.xinitrc
this is fine???
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