dnl CLN_HEADER_GETVAL(NAME,FILE)
dnl Expand at autoconf time to the value of a "#define NAME" from the given
dnl FILE. The regexps here aren't very robust, but are enough for us.
dnl /dev/null as a parameter prevents a hang if $2 is accidentally omitted.
dnl (shamelessly ripped from GMP, and changed prefix to CL_).

define(CL_HEADER_GETVAL,
[patsubst(patsubst(
esyscmd([grep "^#define $1 " $2 /dev/null 2>/dev/null]),
[^.*$1[ 	]+],[]),
[[
 	]*$],[])])
define(CL_GET_VERSION,
[CL_HEADER_GETVAL(CL_VERSION_$1,[include/cln/version.h])])
define(CL_GET_LTVERSION,
[CL_HEADER_GETVAL(CL_LT_$1,[include/cln/version.h])])