[PATCH] dtc: also check <yaml.h> for libyaml

[Jiping Ma]

yamltree.c includes <yaml.h>, If /usr/include/yaml.h does not exist,
it fails to build.

Signed-off-by: Jiping Ma <jiping.ma2@xxxxxxxxxxxxx>
---
 scripts/dtc/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/dtc/Makefile b/scripts/dtc/Makefile
index b5a5b1c..b49dfea 100644
--- a/scripts/dtc/Makefile
+++ b/scripts/dtc/Makefile
@@ -18,9 +18,13 @@ $(error dtc needs libyaml for DT schema validation support. \
 endif
 HOST_EXTRACFLAGS += -DNO_YAML
 else
+ifeq ($(wildcard /usr/include/yaml.h),)
+HOST_EXTRACFLAGS += -DNO_YAML
+else
 dtc-objs	+= yamltree.o
 HOSTLDLIBS_dtc	:= $(shell pkg-config yaml-0.1 --libs)
 endif
+endif
 
 # Generated files need one more search path to include headers in source tree
 HOSTCFLAGS_dtc-lexer.lex.o := -I $(srctree)/$(src)
-- 
1.9.1