The libX11-devel package contains libraries and header files for libX11.
acquired package info from repodata DB: repodata/69e709f4d2852d98f12867a74015d19384fe2727ff670fd70178cdde80b1e77e-primary.sqlite.bz2
development files and header files for libdmx
libdmx-devel contains development files and header files for libdmx
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 libXext
The libXext-devel package contains libraries and header files for developing applications that use libXext.