pkg-config used by rpmbuild to fill pkg-config deps:
/usr/lib/rpm/pkgconfigdeps.sh:pkgconfig=`which pkg-config`
AUTO: -- which: no pkg-config in (/bin:/usr/bin:/usr/sbin:/sbin:/usr/X11R6/bin)
Source0: https://github.com/lz4/lz4/archive/v%{version}/%{name}-%{version}.tar.gz
# Source0-md5: c9610c5ce97eb431dddddf0073d919b9
URL: http://www.lz4.org/
+BuildRequires: pkgconfig
Requires: %{name}-libs = %{epoch}:%{version}-%{release}
BuildRoot: %{tmpdir}/%{name}-%{version}-root-%(id -u -n)