cascading variable resolution in AC_SUBST

[David Oleszkiewicz]

so i want to do something like this

configure.in:
PROGNAME = "foo"
DIR = "${bindir}/${PROG}"
AC_SUBST(DIR)

myfile.h.in:
#define DIR "@DIR@"

when things resolve out to myfile.h i get
#define CONF_DIR "${exec_prefix}/foo"

this is because $bindir = ${exec_prefix}/bin
i.e. we only get one level of variable resolution.
Is there any way around this, or has anyone written a decently portable
macro to make this work.

thanks