AC_CHECK_LIB(g2, main, [g2=true], [g2=false])
AC_CHECK_LIB(wx_gtk, main, [wxwin=true; wx_gtk=true; AC_DEFINE(HAVE_WXWINDOWS)], [wxwin=false])
AC_CHECK_LIB(wx_msw, main, [wxwin=true; wx_msw=true; AC_DEFINE(HAVE_WXWINDOWS)], [wxwin=false])
AC_CHECK_LIB(g2, main, [g2=true], [g2=false])
AC_CHECK_LIB(wx_gtk, main, [wxwin=true; wx_gtk=true; AC_DEFINE(HAVE_WXWINDOWS)], [wxwin=false])
AC_CHECK_LIB(wx_msw, main, [wxwin=true; wx_msw=true; AC_DEFINE(HAVE_WXWINDOWS)], [wxwin=false])
if test "$zlib" = "true" ; then
AC_CHECK_LIB(png, main, [png=true ; AC_DEFINE(HAVE_PNG)], [png=false])
if test "$zlib" = "true" ; then
AC_CHECK_LIB(png, main, [png=true ; AC_DEFINE(HAVE_PNG)], [png=false])