only set PREFERRED_PROVIDER_linux-libc-headers if it is not
already assigned a value.

Signed-off-by: Ben Gardiner <[email protected]>
Tested-by: Andrea Galbusera <[email protected]>
Signed-off-by: Tom Rini <[email protected]>
(cherry picked from commit 829ea5110bc82f71a225f168bcb6a9a327b1b5c8)

Signed-off-by: Ben Gardiner <[email protected]>
---
 conf/distro/include/toolchain-external.inc |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/conf/distro/include/toolchain-external.inc 
b/conf/distro/include/toolchain-external.inc
index ab50308..12dc454 100644
--- a/conf/distro/include/toolchain-external.inc
+++ b/conf/distro/include/toolchain-external.inc
@@ -4,7 +4,7 @@ PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}gcc-initial = 
"external-toolchain-${T
 PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}gcc-intermediate = 
"external-toolchain-${TOOLCHAIN_BRAND}"
 PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}gcc = 
"external-toolchain-${TOOLCHAIN_BRAND}"
 PREFERRED_PROVIDER_virtual/${TARGET_PREFIX}g++ = 
"external-toolchain-${TOOLCHAIN_BRAND}"
-PREFERRED_PROVIDER_linux-libc-headers = "external-toolchain-${TOOLCHAIN_BRAND}"
+PREFERRED_PROVIDER_linux-libc-headers ?= 
"external-toolchain-${TOOLCHAIN_BRAND}"
 
 TOOLCHAIN_VENDOR ?= "${TARGET_VENDOR}"
 TARGET_VENDOR := "${TOOLCHAIN_VENDOR}"
-- 
1.7.1


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