udefined shell vars

[Thien-Thi Nguyen]

I see in configure script output:

./configure: line 34058: test: =: unary operator expected
./configure: line 34061: test: =: unary operator expected

I traced this back to m4/gnulib-comp.m4:

  if test $REPLACE_REALLOC_FOR_CALLOC_GNU = 1; then
    func_gl_gnulib_m4code_682e609604ccaac6be382e4ee3a4eaec
  fi
  if test $REPLACE_REALLOC_FOR_CALLOC_POSIX = 1; then
    func_gl_gnulib_m4code_682e609604ccaac6be382e4ee3a4eaec
  fi

It seems those REPLACE...(GNU|POSIX) vars are not defined
(assigned with a value) anywhere in the configure script.  When
i quote them "$REPLACE..." and re-run the configure script,
there is no more error.  What am i missing?

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