The libX11-devel package contains libraries and header files for libX11.
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Development files and Header files for libXfixes
The libXfixes-devel package contains libraries and header files for developing applications that use libXfixes.
Package compiler and linker metadata toolkit
pkgconf is a program which helps to configure compiler and linker flags for development frameworks. It is similar to pkg-config from freedesktop.org, providing additional functionality while also maintaining compatibility.
X11 miscellaneous "fixes" extension library
The X Fixes extension provides applications with work-arounds for various limitations in the core protocol.