mikaelderrien wrote:

> $ LIBS="-ltsdc++ -lcrypt"

This line does just about nothing...
You need to export the variable if you want its value to be "remembered"
longer than the current line.

So, change that line to:
$ export LIBS="-ltsdc++ -lcrypt"

But, I'm not sure that's the only problem.

> checking for isc_detach_database in -lgds... no
> checking for isc_detach_database in -lib_util... no
> configure: error: libgds or libib_util not found! Check config.log
> for more information.

> configure:37577: checking for isc_detach_database in -lgds
> configure:37596: gcc -o conftest -g -O2
> -L/usr/local/firebird/lib
> conftest.c -lgds -lresolv -lm -ldl -lnsl 1>&5
> /usr/lib/gcc-lib/i486-suse-linux/3.3/../../../../i486-suse-
> linux/bin/ld: cannot find -lgds
> collect2: ld returned 1 exit status

It looks like the linker cannot find your gds library. I haven't
compiled PHP with FB1.5 support, but from what I've read from this list,
it is possible that it has some different name. Better check what
libraries you have in /usr/local/firebird/lib

> any help welcomed :)

I guess this was that: "any help" :)

Good luck.

--
Milan Babuskov
http://fbexport.sourceforge.net