configure.ac: Add back HAVE_SYSTEMD

When the change was made to add some additional
code to make sure systemd was actually installed
on the system, the HAVE_SYSTEMD #define was
accidently removed.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

diff --git a/configure.ac b/configure.ac
index 713cf4080107ba2af1c1340b67aedd9691317c8b..4a9e6dbfb1b25abff4c04e6cebae3608819069ad 100755 (executable)
--- a/configure.ac
+++ b/configure.ac
@@ -347,6 +347,8 @@ case "${enable_systemd}" in
   AC_CHECK_LIB(systemd, sd_notify, LIBS="$LIBS -lsystemd")
   if test $ac_cv_lib_systemd_sd_notify = no; then
     AC_MSG_ERROR([enable systemd has been specified but systemd development env not found on your system])
+  else
+    AC_DEFINE(HAVE_SYSTEMD,,Compile systemd support in)
   fi
   ;;
   "*") ;;