+Force base dir macros to arbitrary values, derived as relative to base ones.
+Now redefining _prefix affects _{bin,sbin,lib,libexec,include,data,dataroot,info,man,doc}dir values.
+
+--- rpm-4.16.1.3/platform.in.orig 2021-03-28 18:12:24.786830780 +0200
++++ rpm-4.16.1.3/platform.in 2021-03-28 18:23:20.670665669 +0200
+@@ -25,23 +25,23 @@
+ #==============================================================================
+ # ---- configure macros.
+ #
+-%_prefix @prefix@
+-%_exec_prefix @exec_prefix@
+-%_bindir @bindir@
+-%_sbindir @sbindir@
+-%_libexecdir @libexecdir@
+-%_datarootdir @datarootdir@
+-%_datadir @datadir@
+-%_sysconfdir @sysconfdir@
+-%_sharedstatedir @sharedstatedir@
+-%_localstatedir @localstatedir@
++%_prefix /usr
++%_exec_prefix %{_prefix}
++%_bindir %{_prefix}/bin
++%_sbindir %{_prefix}/sbin
++%_libexecdir %{_prefix}/libexec
++%_datarootdir %{_prefix}/share
++%_datadir %{_datarootdir}
++%_sysconfdir /etc
++%_sharedstatedir /var/lib
++%_localstatedir /var
+ %_lib @LIB@
+-%_libdir @exec_prefix@/@LIB@
+-%_includedir @includedir@
+-%_oldincludedir @oldincludedir@
+-%_infodir @infodir@
+-%_mandir @mandir@
+-%_initddir %{_sysconfdir}/rc.d/init.d
++%_libdir %{_exec_prefix}/@LIB@
++%_includedir %{_prefix}/include
++%_oldincludedir %{_prefix}/include
++%_infodir %{_datarootdir}/info
++%_mandir %{_datarootdir}/man
++%_initddir /etc/rc.d/init.d
+ # Deprecated misspelling, present for backwards compatibility.
+ %_initrddir %{_initddir}
+ %_rundir @RUNDIR@