Only in libguestfs-1.12.0: autom4te.cache diff -ur libguestfs-1.12.0.old/configure libguestfs-1.12.0/configure --- libguestfs-1.12.0.old/configure 2011-07-20 16:40:27.000000000 +0100 +++ libguestfs-1.12.0/configure 2011-07-20 18:48:50.261315374 +0100 @@ -36849,7 +36849,7 @@ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for virtio-serial support in $QEMU" >&5 $as_echo_n "checking for virtio-serial support in $QEMU... " >&6; } - if $QEMU -nographic -device \? 2>&1 | grep -sq virtio-serial; then + if $QEMU -machine pc,accel=tcg -nographic -device \? 2>&1 | grep -sq virtio-serial; then { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5 $as_echo "yes" >&6; } else diff -ur libguestfs-1.12.0.old/configure.ac libguestfs-1.12.0/configure.ac --- libguestfs-1.12.0.old/configure.ac 2011-07-20 16:35:50.000000000 +0100 +++ libguestfs-1.12.0/configure.ac 2011-07-20 18:48:41.251139811 +0100 @@ -326,7 +326,7 @@ fi AC_MSG_CHECKING([for virtio-serial support in $QEMU]) - if $QEMU -nographic -device \? 2>&1 | grep -sq virtio-serial; then + if $QEMU -machine pc,accel=tcg -nographic -device \? 2>&1 | grep -sq virtio-serial; then AC_MSG_RESULT([yes]) else AC_MSG_RESULT([no])