m4_set_contains cannot find key

[Petre Pircalabu]

Hello,

I'm getting a false negative when trying to test if a set contains a key.
The key is specified as a variable in configure.ac.

Can you please take a look at the following code snippet?

m4_set_add([food], [fish])
m4_set_add([food], [steak])
m4_set_add([food], [junk])

meal=junk

AC_MSG_CHECKING([whether we have junk food for dinner])
m4_set_contains([food], [$meal], [VAL="yes"], [VAL="no"])
AC_MSG_RESULT([${VAL}])

Unfortunately is says that I will be eating healthy food tonight and I
really don't know why.

Many thanks,
Petre