ifdef not allowed

[Karl Eichwalder]

Hello,

I'm wondering why automake doesn't allow conditionals like:

f=$(shell test -e /etc/passwd && echo /etc/passwd)
hello:
        echo hello
ifdef f
        echo $(f)
endif

Reading the automake manual on Conditionals I have got the impression,
only 'if' is allowed.  Why not passing through 'ifdef' structures?  At
least, please improve the error message:

    Makefile.am:24: endif without if

It took me quite some time to understand what automake wants me to do ;)

[Yes, I know, it's easily possible to solve the job mentioned above
going other ways.]

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