Allow re-targeting of naclports install

examples/games/snes9x-1.53/nacl-snes9x-1.53.sh

Index: examples/games/snes9x-1.53/nacl-snes9x-1.53.sh
diff --git a/examples/games/snes9x-1.53/nacl-snes9x-1.53.sh b/examples/games/snes9x-1.53/nacl-snes9x-1.53.sh
index 4f1d2bae0e98694420a246d535b4c30c5b5d2148..57cbd5e147f0de25ad6506fe19c218ac64814e57 100755
--- a/examples/games/snes9x-1.53/nacl-snes9x-1.53.sh
+++ b/examples/games/snes9x-1.53/nacl-snes9x-1.53.sh
@@ -26,22 +26,22 @@ CustomConfigureStep() {
   # export the nacl tools
   export CC=${NACLCC}
   export CXX=${NACLCXX}
-  export CXXFLAGS="-I${NACL_SDK_ROOT}/include"
-  export LDFLAGS=""
+  export CXXFLAGS="${NACLPORTS_CFLAGS} -I${NACL_SDK_ROOT}/include"
+  export LDFLAGS="${NACLPORTS_LDFLAGS}"
   if [ ${NACL_ARCH} = "pnacl" ] ; then
-    export CXXFLAGS="-O3 -g"
-    export LDFLAGS="-O0 -static"
+    export CXXFLAGS="${NACLPORTS_CFLAGS} -O3 -g"
+    export LDFLAGS="${NACLPORTS_LDFLAGS} -O0 -static"
   fi
   export AR=${NACLAR}
   export RANLIB=${NACLRANLIB}
-  export PKG_CONFIG_PATH=${NACL_SDK_USR_LIB}/pkgconfig
-  export PKG_CONFIG_LIBDIR=${NACL_SDK_USR_LIB}
+  export PKG_CONFIG_PATH=${NACLPORTS_LIBDIR}/pkgconfig
+  export PKG_CONFIG_LIBDIR=${NACLPORTS_LIBDIR}
 
   CONFIG_FLAGS="--host=nacl \
-      --prefix=${NACL_SDK_USR} \
-      --exec-prefix=${NACL_SDK_USR} \
-      --libdir=${NACL_SDK_USR_LIB} \
-      --oldincludedir=${NACL_SDK_USR_INCLUDE} \
+      --prefix=${NACLPORTS_PREFIX} \
+      --exec-prefix=${NACLPORTS_PREFIX} \
+      --libdir=${NACLPORTS_LIBDIR} \
+      --oldincludedir=${NACLPORTS_INCLUDE} \
       --disable-gamepad \
       --disable-gzip \
       --disable-zip \
@@ -51,7 +51,7 @@ CustomConfigureStep() {
       --without-x \
       --enable-sound"
 
-  export LIBS="-L${NACL_SDK_USR_LIB} \
+  export LIBS="-L${NACLPORTS_LIBDIR} \
       -lnacl-mounts -lppapi_cpp -lppapi \
       -lpthread -lstdc++"