checking for xcb-proto >= 1.17.0... no configure: error: Package requirements (xcb-proto >= 1.17.0) were not met: Package 'xcb-proto', required by 'virtual:world', not found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables XCBPROTO_CFLAGS and XCBPROTO_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details.