[Libguestfs] Error building nbdkit on RHEL 7.5 - possibly undefined macro: PKG_CHECK_VAR

[Nir Soffer]

I'm trying to build upstream source on RHEL 7.5 and get this error:

# autoreconf -i
libtoolize: putting auxiliary files in `.'.
libtoolize: copying file `./ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'
configure.ac:190: error: possibly undefined macro: PKG_CHECK_VAR
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.
autoreconf: /usr/bin/autoconf failed with exit status: 1

How to fix this? I hope I can avoid reading autoconf documentation :-)

Nir
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