Steps to reproduce:
compile problem for libgda-1.9.103
using firebird-2.0.0.12724-ReleaseCandidate4 and gcc-4.1.1, 

Stack trace:
 gcc "-DPACKAGE_NAME=\"GNU Data Access\"" -DPACKAGE_TARNAME=\"libgda\"
-DPACKAGE_VERSION=\"1.9.103\" "-DPACKAGE_STRING=\"GNU Data Access 1.9.103\""
-DPACKAGE_BUGREPORT=\"gnome-db-list@gnome.org\"
-DBONOBO_EXPLICIT_TRANSLATION_DOMAIN=\"libgda-3\" -DSTDC_HEADERS=1
-DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1
-DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1
-DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -DYYTEXT_POINTER=1 -DGETTEXT_PACKAGE=\"libgda-3\"
-DHAVE_LOCALE_H=1 -DHAVE_LC_MESSAGES=1 -DHAVE_BIND_TEXTDOMAIN_CODESET=1
-DHAVE_GETTEXT=1 -DHAVE_DCGETTEXT=1 -DENABLE_NLS=1 -DHAVE_FAM= -DHAVE_ODBC=1
-DHAVE_FIREBIRD=1 -DHAVE_POPT_H=1 -DHAVE_READLINE_READLINE_H=1
-DHAVE_READLINE_HISTORY_H=1 -I. -I. -I../.. -I../.. -pthread -I/usr/include/glib-2.0
-I/usr/lib/glib-2.0/include -I/usr/include/libxml2 -I/usr/firebird/include
-DLIBGDA_DATA_DIR=\"/usr/share/libgda\" -O -march=athlon -mmmx -m3dnow -pipe -O3 -MT
gda-firebird-recordset.lo -MD -MP -MF .deps/gda-firebird-recordset.Tpo -c
gda-firebird-recordset.c  -fPIC -DPIC -o .libs/gda-firebird-recordset.o
gda-firebird-recordset.c: In function 'fb_gda_value_fill':
gda-firebird-recordset.c:513: error: dereferencing pointer to incomplete type
gda-firebird-recordset.c:513: error: dereferencing pointer to incomplete type
gda-firebird-recordset.c:515: error: dereferencing pointer to incomplete type
gda-firebird-recordset.c: In function 'gda_firebird_recordset_class_init':
gda-firebird-recordset.c:807: warning: assignment from incompatible pointer type
gda-firebird-recordset.c:810: warning: assignment from incompatible pointer type
gda-firebird-recordset.c:812: warning: assignment from incompatible pointer type
make[2]: *** [gda-firebird-recordset.lo] Error 1
make[2]: Leaving directory `/usr/src/libgda-1.9.103/providers/firebird

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