P3: Somewhat important Description
the script configure makes a test at line 5378:
"if [ -n "$PKG_CONFIG" ] && $PKG_CONFIG --atleast-version="$MIN_DBUS_1_VERSION" dbus-1 2>/dev/null; then"
if the command $PKG_CONFIG ist not installed, one get a wrong error:
"The QtDBus module cannot be enabled because libdbus-1 version 0.93 was not found"
in fact, the command is missing!