xcb-proto

XML-XCB protocol descriptions for libxcb code generation

brewmacoslinux

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X.Org: XML-XCB protocol descriptions for libxcb code generation

xcb-proto

Display installed XCB protocol version$ pkg-config --modversion xcb-proto

Locate XCB protocol XML definition files$ pkg-config --variable=xcbincludedir xcb-proto

Check if xcb-proto is installed and available$ pkg-config --exists xcb-proto && echo 'xcb-proto is installed'