[Libguestfs] make install ignoring PREFIX for bash_completion

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/fcbfc4775fa2a440209740735... 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