new file mode 100644
--- /dev/null
+++ b/m4/inttypes_h.m4
@@ -0,0 +1,20 @@
+#serial 1
+
+dnl From Paul Eggert.
+
+# Define HAVE_INTTYPES_H if <inttypes.h> exists,
+# doesn't clash with <sys/types.h>, and declares uintmax_t.
+
+AC_DEFUN(jm_AC_HEADER_INTTYPES_H,
+[
+  AC_CACHE_CHECK([for inttypes.h], jm_ac_cv_header_inttypes_h,
+  [AC_TRY_COMPILE(
+    [#include <sys/types.h>
+#include <inttypes.h>],
+    [uintmax_t i = (uintmax_t) -1;],
+    jm_ac_cv_header_inttypes_h=yes,
+    jm_ac_cv_header_inttypes_h=no)])
+  if test $jm_ac_cv_header_inttypes_h = yes; then
+    AC_DEFINE(HAVE_INTTYPES_H)
+  fi
+])

new file mode 100644
--- /dev/null
+++ b/m4/uintmax_t.m4
@@ -0,0 +1,23 @@
+#serial 1
+
+dnl From Paul Eggert.
+
+# Define uintmax_t to `unsigned long' or `unsigned long long'
+# if <inttypes.h> does not exist.
+
+AC_DEFUN(jm_AC_TYPE_UINTMAX_T,
+[
+  AC_REQUIRE([jm_AC_HEADER_INTTTYPES_H])
+  if test $jm_ac_cv_header_inttypes_h = no; then
+    AC_CACHE_CHECK(for unsigned long long, ac_cv_type_unsigned_long_long,
+    [AC_TRY_COMPILE([],
+      [unsigned long long i = (unsigned long long) -1;],
+      ac_cv_type_unsigned_long_long=yes,
+      ac_cv_type_unsigned_long_long=no)])
+    if test $ac_cv_type_unsigned_long_long = yes; then
+      AC_DEFINE(uintmax_t, unsigned long long)
+    else
+      AC_DEFINE(uintmax_t, unsigned long)
+    fi
+  fi
+])