make[3]: Leaving directory '/root/rpmbuild/BUILD/libxfce4ui-4.15.0/libxfce4ui' make[3]: *** No rule to make target 'libxfce4ui-2.deps', needed by 'libxfce4ui-2.vapi'. Stop. make[3]: *** Waiting for unfinished jobs.... make[3]: Entering directory '/root/rpmbuild/BUILD/libxfce4ui-4.15.0/libxfce4ui'
I was able to solve the issue (if we can speak of a solve here) be grabbing git master and re-creating a dist tarball by issuing: ./autogen.sh --prefix=/usr make dist The resulting tarball was buildable without any issues.
Ping.
Fixed in later 4.15 releases