how to test HAVE_MALLOC

[j . wuttke]

A user of my software package reported that compilation on
a virtual Linux machine running on his Mac failed because
'::malloc' was not declared.

We then found that AC_FUNC_MALLOC actually produced a 'no'
in the ./configure output.

This is not what I expected, and definitely not what I need.
If there is no malloc on a box, I do not want my users do
go into deeper complications; I just want ./configure to
abort with an error message.

If I understand correctly, I need to add a separate stance
to configure.ac that tests whether HAVE_MALLOC has been set
to 1, and otherwise calls AC_MSG_ERROR([Cannot find malloc.]).

Now my question: How to write this test?

My naive approach
  if test $HAVE_MALLOC -ne 1; then
does not work.

Thanks in advance, Joachim

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