linphone build failures

[Debarshi Ray]

Linphone is having some build problems lately:
http://koji.fedoraproject.org/koji/packageinfo?packageID=2457

Since the %changelog shows up some of your email addresses, I thought
maybe you would have some idea about this.

Scratch builds [1] fail with:
[...]
config.status: creating linphone.spec
config.status: creating config.h
config.status: executing depfiles commands
config.status: executing libtool commands
config.status: executing po-directories commands
config.status: creating po/POTFILES
config.status: creating po/Makefile
config.status: executing po/stamp-it commands
config.status: error: po/Makefile.in.in was not created by intltoolize.
error: Bad exit status from /var/tmp/rpm-tmp.kDxWQA (%build)
    Bad exit status from /var/tmp/rpm-tmp.kDxWQA (%build)
RPM build errors:
Child returncode was: 1

While looking at linphone.spec, I came upon the following:
[...]
%build

libtoolize --copy --force
aclocal -I m4
autoheader
automake --force-missing --add-missing --copy
autoconf
rm -rf config.cache

pushd mediastreamer2
libtoolize --copy --force
aclocal -I ../m4
autoheader
automake --force-missing --add-missing --copy
autoconf
popd
[...]

Since regenerating the build scripts in the .spec is looked down upon,
what is the rationale behind doing it here?

Happy hacking,
Debarshi

[1] http://koji.fedoraproject.org/koji/taskinfo?taskID=1237819