Problem compiling ibase driver

[SteM]

Hi all,
i'm trying to compile QT with the iBase support.
Somewhere i read to use -plugin-sql-qibase but it is not recognized by the ./configure. I used -plugin-sql-ibase as stated by the 'configure --help'.

Compiling it i receive an error: ibase.h not found, so i added the option -I/opt/firebird/include.

Now i receive the error

cannot find -lgds
collect2: ld returned 1 exit status
make: *** [ibase] Error 1
InterBase disabled.

cannot find -lgds
collect2: ld returned 1 exit status
make: *** [ibase] Error 1
InterBase disabled.

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I searched for gds library but i did not able to find it

Thanks !!