Add support for GNU rx library for those lacking regexp support
diff --git a/configure.in b/configure.in
index 7ff324b..a6bed75 100644
--- a/configure.in
+++ b/configure.in
@@ -256,6 +256,7 @@
# Checks for libraries.
AC_CHECK_LIB(z, deflate, ,AC_MSG_ERROR([*** zlib missing - please install first ***]))
AC_CHECK_LIB(util, login, AC_DEFINE(HAVE_LIBUTIL_LOGIN) LIBS="$LIBS -lutil")
+AC_CHECK_LIB(rx, regcomp, AC_DEFINE(HAVE_LIBRX) LIBS="$LIBS -lrx")
if test -z "$no_libsocket" ; then
AC_CHECK_LIB(nsl, yp_match, , )