Syntax error in autogen.sh

[SamusAranX]

I just went to install this theme on a newly setup Debian machine, but instead of a successful installation, I got this:

autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
autoreconf: configure.ac: tracing
autoreconf: configure.ac: creating directory build-aux
autoreconf: configure.ac: not using Libtool
autoreconf: running: /usr/bin/autoconf --force
autoreconf: configure.ac: not using Autoheader
autoreconf: running: automake --add-missing --copy --force-missing
configure.ac:12: installing 'build-aux/install-sh'
configure.ac:12: installing 'build-aux/missing'
autoreconf: Leaving directory `.'
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
./configure: line 2604: syntax error near unexpected token `newline'
./configure: line 2604: `    PKG_CHECK_EXISTS('

I have no idea what to do here.

[yarisgutierrez]

You need to install the pkg-config package.