Created attachment 20852 [details] [review]
fix linking issue and add proper expat check

dbus-glib 0.78 doesn't compile due to missing linking to expat library:

./.libs/libdbus-gtool.a(dbus-gloader-expat.o): In function `description_load_from_string':
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:204: undefined reference to `XML_ParserCreate_MM'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:211: undefined reference to `XML_SetUserData'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:212: undefined reference to `XML_SetElementHandler'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:215: undefined reference to `XML_SetCharacterDataHandler'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:218: undefined reference to `XML_Parse'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:261: undefined reference to `XML_ParserFree'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:247: undefined reference to `XML_ParserFree'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:225: undefined reference to `XML_GetErrorCode'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:229: undefined reference to `XML_ErrorString'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:229: undefined reference to `XML_GetCurrentColumnNumber'
/home/users/builder/rpm/BUILD/dbus-glib-0.78/dbus/dbus-gloader-expat.c:229: undefined reference to `XML_GetCurrentLineNumber'
collect2: ld returned 1 exit status

Attached patch fixes it and adds proper expat check / cleans up linking to expat library.
Have fun.