Linux vacca.o2switch.net 4.18.0-553.123.2.lve.el8.x86_64 #1 SMP Thu May 7 23:17:13 UTC 2026 x86_64

//proc/self/root/lib64/pkgconfig/x11-xcb.pc

 prefix=/usr
exec_prefix=/usr
libdir=/usr/lib64
includedir=/usr/include

Name: X11 XCB
Description: X Library XCB interface
Version: 1.6.8
Requires: x11 xcb
Cflags: -I${includedir}
Libs: -L${libdir} -lX11-xcb