POSTIN

/bin/sh

/usr/sbin/update-alternatives --install /etc/ld.so.conf.d/GL.conf gl_conf /etc/ld.so.conf.d/GL/libmesagl1.conf 500
if [ ! -L /etc/ld.so.conf.d/GL.conf ]; then
  /usr/sbin/update-alternatives --auto gl_conf
fi
/sbin/ldconfig

POSTUN

/bin/sh

if [ ! -f /etc/ld.so.conf.d/GL/libmesagl1.conf ]; then
  /usr/sbin/update-alternatives --remove gl_conf /etc/ld.so.conf.d/GL/libmesagl1.conf
fi
/sbin/ldconfig