packages are usually spitted in what apps need to be executed,
this is what is installed by default
for developing, there are extra package-dev packages
these include the files you need when you develop / compile something that needs a package
in your case, installing libX11-devel
also, go into yast, install/remove software, select patterns, and select at least the base development and the C/C++ development patterns, this will install tools and some base libs you will need if you plan to compile your own sources
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