When building the plugin from SVN on ArchLinux, I get the following error while running autogen.sh: configure:3852: error: possibly undefined macro: m4_ifval If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. I noticed it seems to be related to some autotools and/or libtool stuff. With the attached patch it compiles fine. Though I'm not yet sure why it does build on other systems without this. libtool: 2.2.4 automake: 1.10.1 autoconf: 2.62 (the above also affects xfce4-taskmanager, xfce4-battery-plugin and xfce4-systemmonitor-plugin, I'll open bugs for these later)
Created attachment 1751 Possible fix
Committed against all the components that you noted down (r5430). Thanks!
xfce4-eyes-plugin and xfce4-xkb-plugin have the same problem and the same fix works for them
Also done, r5431. Thanks ;)