+AM_CONDITIONAL([HAVE_LIBPNG], [$have_libpng])
+AS_IF([$have_libpng], [AC_DEFINE([HAVE_LIBPNG], [1],
+ [Define to 1 if libpng support is available])])
+
+AC_ARG_ENABLE([lbxgui],
+ [AS_HELP_STRING([--enable-lbxgui],
+ [build the lbxgui tool (requires GTK+) [default=auto]])],
+ [enable_lbxgui=$enableval],
+ [enable_lbxgui=auto])
+
+AS_CASE([$enable_lbxgui],
+ [no], [have_gtk=false],
+ [yes], [DX_CHECK_GTK2([2.16], [have_gtk=true])],
+ [DX_CHECK_GTK2([2.16], [have_gtk=true], [have_gtk=false])])
+
+AM_CONDITIONAL([BUILD_LBXGUI], [$have_gtk])
+
+# Check for utilities used by the test suite.
+DX_PROG_MD5SUM
+AS_IF([test x"$dx_cv_md5sum_works" = x"yes"],
+ [AC_SUBST([HAVE_MD5SUM], [true])],
+ [AC_SUBST([HAVE_MD5SUM], [false])])
+AC_SUBST([MD5SUM])
+
+AC_CHECK_PROGS([PAMARITH], [pamarith], [false])
+AC_CHECK_PROGS([PAMCHANNEL], [pamchannel], [false])
+AC_SUBST([PAMCHANNEL])
+AC_SUBST([PAMARITH])