libgda fails to link on Darwin (Mac OS X 10.4.8) with the following error:

/bin/sh ../../libtool --tag=CC --mode=link gcc  -pipe -O2 -I/Users/msk/pkg/include -I/usr/include  -L/Users/msk/pkg/lib -L/usr/lib -L/usr/X11R6/lib -o libgda_sql_delimiter-3.la -rpath /Users/msk/pkg/lib -version-info 3:0:0  parser.lo lexer.lo gda-sql-delimiter.lo gda-delimiter-tree.lo  
gcc -dynamiclib ${wl}-flat_namespace ${wl}-undefined ${wl}suppress -o .libs/libgda_sql_delimiter-3.3.0.0.dylib  .libs/parser.o .libs/lexer.o .libs/gda-sql-delimiter.o .libs/gda-delimiter-tree.o  -L/Users/msk/pkgsrc/databases/libgda/work/.buildlink/lib -L/Users/msk/pkgsrc/databases/libgda/work/.x11-buildlink/lib  -install_name  /Users/msk/pkg/lib/libgda_sql_delimiter-3.3.dylib -Wl,-compatibility_version -Wl,4 -Wl,-current_version -Wl,4.0
ld: multiple definitions of symbol _all_sql_results
.libs/parser.o definition of _all_sql_results in section (__DATA,__common)
.libs/gda-sql-delimiter.o definition of _all_sql_results in section (__DATA,__common)
/usr/bin/libtool: internal link edit command failed
gnumake[3]: *** [libgda_sql_delimiter-3.la] Error 1

Declaring the variable as "extern" in parser.y will fix the problem.