Missing header files

[Alain Muls]

Hi,

I try to compile a program, but the compiler says that header files are 
missing, such as 

X11/Xlib.h

How can I find out which package to install, so how can I find out to which 
package a certain file belongs.

Tx

-- 
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Alain Muls                       alain.muls at telenet.be
RMA-CISS-ASGE                            +32.2.7426340
Renaissance Avenue 30   B1000 Brussels
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