[Libguestfs] make install ignoring PREFIX for bash_completion

[AP]

I am trying to install the libguestfs python bindings in my
virtualenv. Since this cannot be done through PIP, I was trying to do
the following:

https://github.com/libguestfs/libguestfs/commit/fcbfc4775fa2a44020974073594a745ca420d614

To get to building the python dist, I did the following:

git clone https://github.com/libguestfs/libguestfs.git
git checkout 1.28.5
./autogen.sh --disable-php --disable-ruby --disable-gobject
--disable-golang --disable-erlang --disable-lua
--prefix=/home/dev/venv
make
rm po-docs/podfiles; make -C po-docs update-po
make
make -C python sdist
make install

However at the "make install" step, I get the following error:

make[2]: Entering directory '/home/dev/libguestfs/bash'
make[2]: Nothing to be done for 'install-exec-am'.
/bin/mkdir -p /usr/share/bash-completion/completions
cp -d guestfish guestmount virt-alignment-scan virt-rescue virt-resize
virt-builder virt-cat virt-df virt-edit virt-filesystems virt-format
virt-inspector virt-log virt-ls virt-sparsify virt-sysprep
/usr/share/bash-completion/completions
cp: cannot create regular file
'/usr/share/bash-completion/completions/guestfish': Permission denied
cp: cannot create regular file
'/usr/share/bash-completion/completions/guestmount': Permission denied
cp: cannot create regular file
'/usr/share/bash-completion/completions/virt-alignment-scan':
Permission denied
cp: cannot create regular file
'/usr/share/bash-completion/completions/virt-rescue': Permission
denied
cp: cannot create regular file
'/usr/share/bash-completion/completions/virt-resize': Permission
denied
cp: cannot remove
'/usr/share/bash-completion/completions/virt-builder': Permission
denied
cp: cannot remove '/usr/share/bash-completion/completions/virt-cat':
Permission denied
cp: cannot remove '/usr/share/bash-completion/completions/virt-df':
Permission denied
cp: cannot remove '/usr/share/bash-completion/completions/virt-edit':
Permission denied
cp: cannot remove
'/usr/share/bash-completion/completions/virt-filesystems': Permission
denied
cp: cannot remove
'/usr/share/bash-completion/completions/virt-format': Permission
denied
cp: cannot remove
'/usr/share/bash-completion/completions/virt-inspector': Permission
denied
cp: cannot remove '/usr/share/bash-completion/completions/virt-log':
Permission denied
cp: cannot remove '/usr/share/bash-completion/completions/virt-ls':
Permission denied
cp: cannot remove
'/usr/share/bash-completion/completions/virt-sparsify': Permission
denied
cp: cannot remove
'/usr/share/bash-completion/completions/virt-sysprep': Permission
denied
Makefile:1671: recipe for target 'install-data-local' failed
make[2]: *** [install-data-local] Error 1


Why is the install process trying to copy files in to /usr/share/ and
not /home/dev/venv/usr/share/? Am I doing something wrong or is there
a workaround for this?

Thanks,
AP