+AM_PROG_CC_C_O
+gl_EARLY
+
+AC_HEADER_ASSERT
+LT_INIT
+gl_INIT
+
+m4_include([lib/gnulib.mk])
+
+PKG_PROG_PKG_CONFIG
+
+AC_ARG_ENABLE([lbximg],
+ [AS_HELP_STRING([--enable-lbximg],
+ [build the lbximg tool (requires libpng) [default=auto]])],
+ [enable_lbximg=$enableval],
+ [enable_lbximg=auto])
+
+have_libpng=no
+if test x"$enable_lbximg" = x"auto"; then
+DX_CHECK_LIBPNG([1.2], [have_libpng=yes], [have_libpng=no])
+fi
+if test x"$enable_lbximg" = x"yes"; then
+DX_CHECK_LIBPNG([1.2], [have_libpng=yes])
+fi
+AM_CONDITIONAL([BUILD_LBXIMG], [test x"$have_libpng" = x"yes"])