I'm trying to add the interbase-extension on mamp (osx lamp),
xcode, macports and m4 is there, phpize runs fine,
upon
./configure --with-interbase=shared,/Library/Frameworks/Firebird.framework

I get
...
hecking for InterBase support... yes, shared
checking for isc_detach_database in -lfbclient... no
checking for isc_detach_database in -lgds... no
checking for isc_detach_database in -lib_util... no
configure: error: libgds, libib_util or libfbclient not found!

Rightfully, none of above, nor libfbclient.dylib or similar is present.
Where is it??
(Flamerobin runs fine, but maby it has a static lib?)

/Library on osx contains
libib_util.dylib
libicui18n.dylib
libicudata.dylib
libicuuc.dylib

I've tried to add:
ln -s libib_util.dylib libib_util, no success

FB-superserver2.1.3
php 5.2.6 (MAMP)
osx 10.5.6