[PATCH v2 4/4] examples: fix build dependencies

[Thomas Monjalon <thomas.monjalon@6wind.com>]

When building for ARM some examples were failing to compile because
of some dependencies disabled.
Declaring these dependencies prevent from trying to compile some
not supported examples.

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
---
 examples/Makefile | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/examples/Makefile b/examples/Makefile
index 1cb4785..1665df1 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -46,21 +46,25 @@ endif
 DIRS-y += ethtool
 DIRS-y += exception_path
 DIRS-y += helloworld
-DIRS-y += ip_pipeline
-DIRS-y += ip_reassembly
+DIRS-$(CONFIG_RTE_LIBRTE_PIPELINE) += ip_pipeline
+ifeq ($(CONFIG_RTE_LIBRTE_LPM),y)
+DIRS-$(CONFIG_RTE_IP_FRAG) += ip_reassembly
 DIRS-$(CONFIG_RTE_IP_FRAG) += ip_fragmentation
+endif
 DIRS-y += ipv4_multicast
 DIRS-$(CONFIG_RTE_LIBRTE_KNI) += kni
 DIRS-y += l2fwd
 DIRS-$(CONFIG_RTE_LIBRTE_IVSHMEM) += l2fwd-ivshmem
 DIRS-$(CONFIG_RTE_LIBRTE_JOBSTATS) += l2fwd-jobstats
 DIRS-y += l2fwd-keepalive
-DIRS-y += l3fwd
+DIRS-$(CONFIG_RTE_LIBRTE_LPM) += l3fwd
 DIRS-$(CONFIG_RTE_LIBRTE_ACL) += l3fwd-acl
+ifeq ($(CONFIG_RTE_LIBRTE_LPM),y)
 DIRS-$(CONFIG_RTE_LIBRTE_POWER) += l3fwd-power
 DIRS-y += l3fwd-vf
+endif
 DIRS-y += link_status_interrupt
-DIRS-y += load_balancer
+DIRS-$(CONFIG_RTE_LIBRTE_LPM) += load_balancer
 DIRS-y += multi_process
 DIRS-y += netmap_compat/bridge
 DIRS-$(CONFIG_RTE_LIBRTE_REORDER) += packet_ordering
-- 
2.7.0