Member Avatar for libathos

Can anyone tell me how can i install the xlib.h library in the gcc compiler of ubuntu?

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Short version: the header and linker pieces you need come from your system's X11 development files, and the compiler has to be pointed at them. was on the right track; 's question about whether the files are present is the right first check. Below are practical checks and fixes that avoid re-stating the exact snippets already posted.

Start by locating the header files on your system (this shows where the dev files actually live):

sudo updatedb
locate Xlib.h
# or, if locate isn't available:
sudo find /usr/include /usr/local/include -type f -iname '*xlib*.h' 2>/dev/null

If the header isn't found, the development package for X11 is missing and must be installed with your distro's package manager. If the header is present but the compiler still complains, inspect the compiler's include search paths:

echo | gcc -v -E -x c -

That output lists the directories the preprocessor searches; if the directory containing the X headers isn't listed, add an explicit include path or use your distro's packaging to put the files in a standard location.

For linking, prefer using pkg-config to get the correct compile/link flags rather than guessing names. Example:

pkg-config --cflags --libs x11

Use those outputs when invoking the compiler. If your source is C++ use the C++ driver (so the C++ standard library is handled automatically).

Notes and common pitfalls: file names are case-sensitive (capitalization matters), mixing gcc/g++ can cause undefined-reference errors, and a missing “-dev” (or equivalent) package is the most common root cause. If errors persist, include the exact compiler output so the problem can be diagnosed further.

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Member Avatar for griswolf

I'm pretty sure it is already there. What makes you think it isn't?

Member Avatar for libathos

for one thing it doesnt recognise the xlib commands..

Member Avatar for JasonHippy

1. Check your distros package manager and make sure you have the libx11-dev package installed (on debian based distros) OR libx11-devel (on Fedora/rpm based distros). This provides the basic headers that will allow you to create client programs using Xlib. The runtime binaries should already be installed. If you need the package, install it using one of your distros package management programs (aptitude, apt-get, yum....whatever!)

2. To include the headers in your programs use: #include <X11/Xlib.h> Finally and most importantly:
3. Use the '-l X11' option on the command-line to allow the linker to find the appropriate library and link your program.
e.g. gcc -o myprogram myprogram.c -l X11 That's all I can think of offhand. Hope that clears things up for you!

Member Avatar for libathos

ok guys thx for help :)

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