build: require Jansson if QEMU driver is enabled

If the QEMU driver was requested, require Jansson, since we need to use
the JSON monitor to probe capabilities for all QEMU version supported
by libvirt.

Signed-off-by: Ján Tomko <jtomko@redhat.com>

diff --git a/m4/virt-driver-qemu.m4 b/m4/virt-driver-qemu.m4
index ddb283470596babc2a05cf4e5be650d62b04c886..2d9992d0dc6c35770e2e475c49ba29df75dcd2c2 100644 (file)
--- a/m4/virt-driver-qemu.m4
+++ b/m4/virt-driver-qemu.m4
@@ -27,6 +27,9 @@ AC_DEFUN([LIBVIRT_DRIVER_ARG_QEMU], [
 
 AC_DEFUN([LIBVIRT_DRIVER_CHECK_QEMU], [
   AC_REQUIRE([LIBVIRT_CHECK_JANSSON])
+  if test "$with_qemu:$with_jansson" = "yes:no"; then
+    AC_MSG_ERROR([Jansson >= 2.5 is required to build QEMU driver])
+  fi
   if test "$with_qemu" = "check"; then
     with_qemu=$with_jansson
   fi