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