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 libXfixes
The libXfixes-devel package contains libraries and header files for developing applications that use libXfixes.
Development files and Header files for libXdamage
The libXdamage-devel package contains libraries and header files for libXdamage.
The X Damage Extension allows applications to track modified regions of drawables.