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[libvirt] [PATCH] build: force configure failed when perl is missing

Perl is necessary to our build processing, it will invoke a lot of
generating script, like: gendispatch.pl. If perl is missing, it's
ok for build from git checkout, because autogen.sh will tell you.
But for compiling from a release tarball, configure will just record
a missing message, and continue, then build failed, like:

So need to enhance configure script to handle this negative case.

Reported-by: Hongbin Lu <hongbin savinetwork ca>
Signed-off-by: Jincheng Miao <jmiao redhat com>
 configure.ac |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index 081f298..af3fe28 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2173,6 +2173,9 @@ AM_CONDITIONAL([WITH_HYPERV], [test "$with_hyperv" = "yes"])
 dnl Allow perl/python overrides
 AC_PATH_PROGS([PYTHON], [python2 python])
 AC_PATH_PROG([PERL], [perl])
+if test -z "$PERL"; then
+         AC_MSG_ERROR([Failed to find perl.])

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