MurKit

creating cache /home/machine/.phpbrew/cache/config.cache
./configure: 1867: ./configure: cannot create /home/machine/.phpbrew/cache/config.cache: Directory nonexistent
checking for Cygwin environment... no
checking for mingw32 environment... no
checking for egrep... grep -E
checking for a sed that does not truncate output... /bin/sed
checking host system type... x86_64-unknown-linux-gnu
checking target system type... x86_64-unknown-linux-gnu
checking for gcc... gcc
checking whether the C compiler (gcc  ) works... yes

MurKit

First of all, file ~/Kindle/usbnet/etc/config

# NOTE: The K4 has a specific default
HOST_IP=192.168.15.201
KINDLE_IP=192.168.15.244

To get the real identifier of network interface dmesg | grep usb0 (enp0s20f0u2)