+dnl ------------------
+dnl Set RPM build root
+dnl ------------------
+dnl nmhrpm is used in the final summary, see below. The default value is
+dnl reported there as ./RPM, consistent with the reporting of the default
+dnl source code location as ., but its absolute path is used in the Makefile.
+AC_ARG_WITH(rpmdir,
+ AS_HELP_STRING([--with-rpmdir=RPMDIR], [RPM build directory @<:@RPM@:>@]))
+ AS_IF([test x"$with_rpmdir" = x], [rpmdir='$(abs_srcdir)/RPM'; nmhrpm=./RPM],
+ [rpmdir="$with_rpmdir"; eval "nmhrpm=${rpmdir}"])
+AC_SUBST(rpmdir)
+