Add a nativeclient build script

dist-build/Makefile.am

@@ -11,4 +11,5 @@ EXTRA_DIST = \
 	emscripten.sh \
 	ios.sh \
 	msys2-win32.sh \
-	msys2-win64.sh
+	msys2-win64.sh \
+	nativeclient.sh

dist-build/nativeclient.sh

@@ -0,0 +1,28 @@
+#! /bin/sh
+
+export NACL_SDK_ROOT=${NACL_SDK_ROOT-"/opt/nacl_sdk/pepper_45"}
+export NACL_TOOLCHAIN=${NACL_TOOLCHAIN-"${NACL_SDK_ROOT}/toolchain/mac_pnacl"}
+export NACL_BIN=${NACL_BIN-"${NACL_TOOLCHAIN}/bin"}
+export PREFIX="$(pwd)/libsodium-nativeclient"
+export PATH="${NACL_BIN}:$PATH"
+export AR=${AR-"pnacl-ar"}
+export AS=${AS-"pnacl-as"}
+export CC=${CC-"pnacl-clang"}
+export LD=${LD-"pnacl-ld"}
+export NM=${NM-"pnacl-nm"}
+export RANLIB=${RANLIB-"pnacl-ranlib"}
+export PNACL_FINALIZE=${PNACL_FINALIZE-"pnacl-finalize"}
+export PNACL_TRANSLATE=${PNACL_TRANSLATE-"pnacl-translate"}
+
+mkdir -p $PREFIX || exit 1
+
+make distclean > /dev/null
+
+./configure --enable-minimal \
+            --host=nacl \
+            --prefix="$PREFIX" || exit 1
+
+make -j3 check && make -j3 install || exit 1
+
+# Cleanup
+make distclean > /dev/null