sane-toolchain.inc: PREFERRED_VERSION_linux-libc-headers assignment conditional.

Signed-off-by: Khem Raj <raj.khem@gmail.com>

diff --git a/conf/distro/include/sane-toolchain.inc b/conf/distro/include/sane-toolchain.inc
index dff4b9f..72fff98 100644 (file)
--- a/conf/distro/include/sane-toolchain.inc
+++ b/conf/distro/include/sane-toolchain.inc
@@ -24,7 +24,7 @@ PREFERRED_GCC_VERSION_xilinx-ml403   ?= "4.1.1"
 PREFERRED_GCC_VERSION_xilinx-ml403   ?= "4.1.1"
 
 # This is unrelated to the kernel version, but userspace apps (e.g. HAL) require a recent version to build against
-PREFERRED_VERSION_linux-libc-headers = "2.6.23"
+PREFERRED_VERSION_linux-libc-headers ?= "2.6.23"
 
 # Uncomment this if want need to build an armv7a kernel with CSL toolchain (<2.6.27 don't boot with mainline gcc)
 #KERNEL_CCSUFFIX_armv7a= "-4.2.1+csl-arm-2007q3-53"