As I wrote in
https://labs.parabola.nu/issues/700
I still had the following problem during the build of icedove-1:31.7.0.deb1-1.
And if I make the symbolic link like:
/usr/lib# ln -s libvpx.so.2.0.0 libvpx.so.1
the build finished without error and the new icedove works good so far.

Executing /mnt/tmp/abslibre/libre/icedove/src/comm-esr31/obj-x86_64-unknown-linu
x-gnu/mozilla/dist/bin/xpcshell -g /mnt/tmp/abslibre/libre/icedove/src/comm-esr3
1/obj-x86_64-unknown-linux-gnu/mozilla/dist/bin/ -a /mnt/tmp/abslibre/libre/iced
ove/src/comm-esr31/obj-x86_64-unknown-linux-gnu/mozilla/dist/bin/ -f /mnt/tmp/ab
slibre/libre/icedove/src/comm-esr31/mozilla/toolkit/mozapps/installer/precompile
_cache.js -e precompile_startupcache("resource://gre/");
/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/obj-x86_64-unknown-linux-gnu/mozi
lla/dist/bin/xpcshell: error while loading shared libraries: libvpx.so.1: cannot
open shared object file: No such file or directory
Traceback (most recent call last):
File "/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/mozilla/toolkit/mozapps/i
nstaller/packager.py", line 401, in <module>
main()
File "/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/mozilla/toolkit/mozapps/installer/packager.py", line 393, in main
args.source, gre_path, base)
File "/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/mozilla/toolkit/mozapps/installer/packager.py", line 158, in precompile_cache
errors.fatal('Error while running startup cache precompilation')
File "/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/mozilla/python/mozbuild/mozpack/errors.py", line 101, in fatal
self._handle(self.FATAL, msg)
File "/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/mozilla/python/mozbuild/mozpack/errors.py", line 96, in _handle
raise ErrorMessage(msg)
mozpack.errors.ErrorMessage: Error: Error while running startup cache precompilation
/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/mozilla/toolkit/mozapps/installer/packager.mk:722: recipe for target 'stage-package' failed
make²: * [stage-package] Error 1
make²: Leaving directory '/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/obj-x86_64-unknown-linux-gnu/mail/installer'
/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/mail/build.mk:24: recipe for target 'install' failed
make¹: [install] Error 2
make¹: Leaving directory '/mnt/tmp/abslibre/libre/icedove/src/comm-esr31/obj-x86_64-unknown-linux-gnu'
client.mk:398: recipe for target 'install' failed
make: ** [install] Error 2
==> ERROR: A failure occurred in package().
Aborting...