Allow re-targeting of naclports install

libraries/gtest-1.5.0/nacl-gtest-1.5.0.sh

Index: libraries/gtest-1.5.0/nacl-gtest-1.5.0.sh
diff --git a/libraries/gtest-1.5.0/nacl-gtest-1.5.0.sh b/libraries/gtest-1.5.0/nacl-gtest-1.5.0.sh
index 6012e54ba65e2c2138d3b84bc5cab70322cfed57..59716675c8f42fbfea57b83a68e384aa96c7c7b8 100755
--- a/libraries/gtest-1.5.0/nacl-gtest-1.5.0.sh
+++ b/libraries/gtest-1.5.0/nacl-gtest-1.5.0.sh
@@ -28,11 +28,11 @@ CustomConfigureStep() {
 }
 
 CustomInstallStep() {
-  Remove ${NACL_SDK_USR_INCLUDE}/gtest
+  Remove ${NACLPORTS_INCLUDE}/gtest
   readonly THIS_PACKAGE_PATH=${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
-  (ChangeDir include; tar cf - --exclude='gtest-death-test.h' --exclude='gtest-death-test-internal.h' gtest | (ChangeDir ${NACL_SDK_USR_INCLUDE}; tar xfp -))
-  Remove ${NACL_SDK_USR_LIB}/${LIB_GTEST}
-  install -m 644 ${LIB_GTEST} ${NACL_SDK_USR_LIB}/${LIB_GTEST}
+  (ChangeDir include; tar cf - --exclude='gtest-death-test.h' --exclude='gtest-death-test-internal.h' gtest | (ChangeDir ${NACLPORTS_INCLUDE}; tar xfp -))
+  Remove ${NACLPORTS_LIBDIR}/${LIB_GTEST}
+  install -m 644 ${LIB_GTEST} ${NACLPORTS_LIBDIR}/${LIB_GTEST}
   DefaultTouchStep
 }