Since we now have a release of gnome-autoar, I figured I'd build evo-3.21.91 with support for it.

What I found was that configure did not "recognise" the installed gnome-autoar

This simple diff fixed that

--- orig-evolution-3.21.91/configure.ac	2016-08-26 17:36:41.000000000 +0200
+++ evolution-3.21.91/configure.ac	2016-09-01 23:48:07.635335026 +0200
@@ -368,8 +368,8 @@
 if test x"$enable_autoar" = xyes; then
 	PKG_CHECK_MODULES(
 		[AUTOAR],
-		[gnome-autoar >= gnome_autoar_minimum_version
-		 gnome-autoar-gtk >= gnome_autoar_minimum_version],,
+		[gnome-autoar-0 >= gnome_autoar_minimum_version
+		 gnome-autoar-gtk-0 >= gnome_autoar_minimum_version],,
 		[AC_MSG_ERROR([
 
 	gnome-autoar or gnome-autoar-gtk not found

----

However the build failed further down with this:

[  250s] Making all in e-util
[  250s] make[2]: Entering directory '/home/abuild/rpmbuild/BUILD/evolution-3.21.91/e-util'
[  250s]   GEN      e-util-enumtypes.h
[  250s]   GEN      e-util-enumtypes.c
[  250s]   GEN      e-marshal.c
[  250s]   GEN      e-marshal.h
[  250s] LC_ALL=C /usr/bin/intltool-merge -x -u /tmp/notthere e-system.error.xml e-system.error
[  251s] Merging translations into e-system.error.
[  251s] CREATED e-system.error
[  251s] LC_ALL=C /usr/bin/intltool-merge -x -u /tmp/notthere filter.error.xml filter.error
[  251s] Merging translations into filter.error.
[  251s] CREATED filter.error
[  251s] LC_ALL=C /usr/bin/intltool-merge -x -u /tmp/notthere widgets.error.xml widgets.error
[  251s] Merging translations into widgets.error.
[  251s] CREATED widgets.error
[  251s] make  all-am
[  251s] make[3]: Entering directory '/home/abuild/rpmbuild/BUILD/evolution-3.21.91/e-util'
[  251s]   CC       libevolution_util_la-e-action-combo-box.lo
[  254s]   CC       libevolution_util_la-e-activity-bar.lo
[  258s]   CC       libevolution_util_la-e-activity-proxy.lo
[  261s]   CC       libevolution_util_la-e-activity.lo
[  264s]   CC       libevolution_util_la-e-alarm-selector.lo
[  267s]   CC       libevolution_util_la-e-alert-bar.lo
[  270s]   CC       libevolution_util_la-e-alert-dialog.lo
[  273s]   CC       libevolution_util_la-e-alert-sink.lo
[  276s]   CC       libevolution_util_la-e-alert.lo
[  279s]   CC       libevolution_util_la-e-attachment-bar.lo
[  282s]   CC       libevolution_util_la-e-attachment-dialog.lo
[  284s]   CC       libevolution_util_la-e-attachment-handler-image.lo
[  287s]   CC       libevolution_util_la-e-attachment-handler.lo
[  290s]   CC       libevolution_util_la-e-attachment-icon-view.lo
[  293s]   CC       libevolution_util_la-e-attachment-paned.lo
[  296s]   CC       libevolution_util_la-e-attachment-store.lo
[  299s] e-attachment-store.c:32:33: fatal error: gnome-autoar/autoar.h: No such file or directory
[  299s]  #include <gnome-autoar/autoar.h>
[  299s]                                  ^
[  299s] compilation terminated.


Since evolution source scares the daylights out of me, I stopped hacking anymore at it :-)