pgagent linker problem

When I try make pgagent binary (Solaris 10/SS11/wx2.8rc3), linker does
not recognize some symbols:

Undefined                       first referenced
  symbol                             in file
wxRadioButtonNameStr                connection.o
wxFileDialogNameStr                 connection.o
wxComboBoxNameStr                   connection.o
wxToolBarNameStr                    connection.o
<snip>

If I look into Makefile, there is
pgagent_LDADD = -L/opt/wxWidgegets-2.8.0/lib -mt   -L/usr/openwin/lib
-lwx_baseud-2.8

However missing symbols are located in the wx_gtk2ud_core-2.8. If I
added this library into pgagent_LDADD, it works fine.

Do you have any idea why it does not work - why configure does not setup
correct LD?

        thanks Zdenek