syntax error in a script

[M.W. Chang]

what's wrong with the following line? when executed, it produced a 
syntax error:

## parse params
P=( "$@" ); n=0; DIROUT="."; FILEOUT=""

the error:

/usr/bin/hb-build: [: ==: binary operator expected
/usr/bin/hb-build: [: ==: binary operator expected
/usr/bin/hb-build: syntax error near unexpected token `P=('
/usr/bin/hb-build: /usr/bin/hb-build: line 47: `P=( "$@" ); n=0; 
DIROUT="."; FILEOUT=""'


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   ^ ^    7:14pm up 1 day, 21:39, 1 user, load average: 1.07, 1.03, 1.10