The libXt-devel package contains libraries and header files for libXt.
acquired package info from repodata DB: repodata/f1f85c23079e7764ad00378a9fc5d660b89a03657290e75426caf7be5b7da462-primary.sqlite.bz2
The libX11-devel package contains libraries and header files for libX11.
X.Org X11 libXmu/libXmuu runtime libraries
The libXmu-devel package contains libraries and header files for libXmu.
development files and header files for libXext
The libXext-devel package contains libraries and header files for developing applications that use libXext.