makeing HTK3.4 on karmic

When do "make all" for htk3.4 on karmic, i get error "HGraf.c:73:77: X11/Xlib.h: No such file or director". this be solved by ...

poj@ubuntu:~/Downloads$ sudo aptitude install libx11-dev
Reading package lists... Done
Building dependency tree        
Reading state information... Done
Reading extended state information       
Initializing package states... Done
The following NEW packages will be installed:
  libpthread-stubs0{a} libpthread-stubs0-dev{a} libx11-dev libxau-dev{a} libxcb1-dev{a} libxdmcp-dev{a} x11proto-core-dev{a} x11proto-input-dev{a} 
  x11proto-kb-dev{a} xtrans-dev{a} 
0 packages upgraded, 10 newly installed, 0 to remove and 0 not upgraded.
Need to get 2,242kB of archives. After unpacking 6,124kB will be used.
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Initializing package states... Done
Writing extended state information... Done

poj@ubuntu:~/Downloads$ 

now try again.