libvpx-sysroot.patch

Our contrib system already passes the correct sysroot to the compiler, so there
is no need to set an alternate libc path. If that path is empty the script will
try to look for it in some fashion, but since the SDKROOT may be in a
non standard location the look up may fail.

This patch avoids that case and relies on the user configuration for the
correct sysroot.

See also https://code.google.com/p/webm/issues/detail?id=809

diff --git a/build/make/configure.sh b/build/make/configure.sh
index d4124c7..c420d25 100755
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -939,8 +939,11 @@ EOF
                           awk '{ print $1 }' | tail -1`
             fi
 
-            add_cflags "--sysroot=${alt_libc}"
-            add_ldflags "--sysroot=${alt_libc}"
+            # this may happen if toolchain binaries are outside the ndk dir
+            if [ "${alt_libc}" ]; then
+                add_cflags "--sysroot=${alt_libc}"
+                add_ldflags "--sysroot=${alt_libc}"
+            fi
 
             # linker flag that routes around a CPU bug in some
             # Cortex-A8 implementations (NDK Dev Guide)
-- 
1.8.3.2