+AC_CONFIG_MACRO_DIR([m4])
+
+AM_INIT_AUTOMAKE([-Wall -Werror foreign subdir-objects])
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
+AC_PROG_CC_C99
+gl_EARLY
+
+AC_HEADER_ASSERT
+LT_INIT
+gl_INIT
+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])