The libX11-devel package contains libraries and header files for libX11.
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Distributed Multihead X extension library
The X.Org project provides an open source implementation of the X Window System. The development work is being done in conjunction with the freedesktop.org community. The X.Org Foundation is the educational non-profit corporation whose Board serves this effort, and whose Members lead this work.
development files and header files for libdmx
libdmx-devel contains development files and header files for libdmx
development files and header files for libXext
The libXext-devel package contains libraries and header files for developing applications that use libXext.