When checking out GIT Master of Thunar, then after running ./autogen.sh and then configure, the TPA detection is broken. Neither "yes" or "no" will be print out during configure process... it stays "build TPA plugin..." and then proceeds with further plugin builds and detects yes or now. Although the "Makefile" is being generated but the TPA plugin will not be build until you manually enter the TPA plugin directory and run "make". To build the TPA plugin. Looks like some issue within the configure.ac file...
Andre Miranda referenced this bugreport in commit 8dedd2f8197c8cd14b5b8bfae7510e34f68abc0d Fix TPA plugin build detection (Bug #13952) https://git.xfce.org/xfce/thunar/commit?id=8dedd2f8197c8cd14b5b8bfae7510e34f68abc0d
This commit replaced the dependency of dbus-glib: https://git.xfce.org/xfce/thunar/commit/?id=4ce7c649f248d90d063440ca8e6db06e64f94e69 So the DBUS_FOUND variable required by acinclude.m4 doesn't exists anymore. Since dbus support is not optional anymore, it makes no sense the current check. Thanks, nice catch, I swear I didn't notice this =)