--- a/configure.ac
+++ b/configure.ac
@@ -140,6 +140,7 @@
 if test x$vformat = xtrue; then
    AC_CHECK_HEADER([vf_iface.h], [
      AC_CHECK_LIB([vformat], [vf_read_file], [
+     LIBS="$LIBS -lvformat"
      MODULES="$MODULES m_vcf"
      AC_DEFINE(HAVE_VFORMAT,1,[Defined if the vformat library is available])
      have_vformat=yes