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[ubuntu] fatal error: X11/Xlib.h:

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http://ubuntuforums.org – hi. i am using ubuntu 12.04 and trying to install NS2.35 for that matter i downloaded ns-allinone-2.35, unzipped it, started installation, the installation went well until it gave an error message and stopped. the error message is as follows: : fatal error: X11/Xlib.h: No such file or directory compilation terminated. make: *** [tk3d.o] Error 1 tk8.5.10 make failed! Exiting ... I'm pretty sure that I do have Xlib.h at the right place. i also tried to do this 'sudo apt-get install libx11-dev' but it returned me the following: "Package libx11-dev is not available, but is referr (Hardware)