The build error was a link failure not finding S_ISDIR
which is a macro provided for the stat syscall..
--- /dev/null
+Index: m4-1.4.14/src/path.c
+===================================================================
+--- m4-1.4.14.orig/src/path.c
++++ m4-1.4.14/src/path.c
+@@ -24,6 +24,11 @@
+
+ #include "m4.h"
+
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <unistd.h>
++
++
+ struct includes
+ {
+ struct includes *next; /* next directory to search */
PR = "${INC_PR}.0"
+SRC_URI += "file://f13-compile.patch;patch=1"
+
SRC_URI[archive.md5sum] = "e6fb7d08d50d87e796069cff12a52a93"
SRC_URI[archive.sha256sum] = "0885ffa93256353a96b1cf0bcbc4d639ed09953b687e6cc412c4048e656f4dd2"