Error in configure script, probably related to sed usage

[cejkato2]

On my Fedora 23, there is an error/warning message in the output of configure:

checking host system type... x86_64-unknown-linux-gnu
sed: -e expression #1, char 0: no previous regular expression
checking for pkg-config... /usr/bin/pkg-config

configure finished successfuly and libnetconf seems to be installed, however, I don'ŧ know if this causes something hidden which is bad...

Info: master branch, a7fece9.