dependencies: check that a full perl installation is available

The host-autoconf build process requires a full Perl installation, or
at least a Perl installation that has the Data::Dumper module
installed. On a basic Debian system, only 'perl-base' is installed,
but Data::Dumper is in the 'perl' package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

support/dependencies/dependencies.sh

@@ -192,3 +192,11 @@ if grep -q ^BR2_HOSTARCH_NEEDS_IA32_LIBS=y $BUILDROOT_CONFIG ; then
 	exit 1
     fi
 fi
+
+# Check that the Perl installation is complete enough to build
+# host-autoconf.
+if ! perl  -e "require Data::Dumper" > /dev/null 2>&1 ; then
+    /bin/echo -e "Your Perl installation is not complete enough, at least Data::Dumper is missing."
+    /bin/echo -e "On Debian/Ubuntu distributions, install the 'perl' package."
+    exit 1
+fi