Autoconf-2.69 problem was fixed by below acinclude.m4 modification. Tested on macOS10.12.3/MacPorts and FreeBSD 11.0-RELEASE. Patch attached, please verify :-)
diff --git a/urjtag/acinclude.m4 b/urjtag/acinclude.m4
index 59fcc23..2628764 100644
--- a/urjtag/acinclude.m4
+++ b/urjtag/acinclude.m4
@@ -149,16 +149,6 @@ AC_DEFUN([AS_VAR_PREPEND], [$1=$2${$1}])
])dnl
-dnl AS_VAR_APPEND
-dnl -------------
-dnl
-dnl this was added in autoconf-2.64+
-dnl
-m4_ifndef([AS_VAR_APPEND],[dnl
-AC_DEFUN([AS_VAR_APPEND], [$1=${$1}$2])
-])dnl
-
-
dnl m4_ifnblank
dnl -----------
dnl
--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
0001-Fixed-build-for-autoconf-2.69.patch
Description: Binary data
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