Allow re-targeting of naclports install

libraries/bzip2-1.0.6/nacl-bzip2-1.0.6.sh

 #!/bin/bash
 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
 # nacl-bzip2-1.0.6.sh
 #
 # usage:  nacl-bzip2-1.0.6.sh
 #
@@ skipping 14 matching lines @@
 CustomBuildStep() {
   make clean
   make CC=${NACLCC} AR=${NACLAR} RANLIB=${NACLRANLIB} -j${OS_JOBS} libbz2.a
 }
 
 CustomInstallStep() {
   # assumes pwd has makefile
 
   # Don't rely on make install, as it implicitly builds executables
   # that need things not available in newlib.
-  mkdir -p ${NACL_SDK_USR}/include
-  cp -f bzlib.h ${NACL_SDK_USR}/include
-  chmod a+r ${NACL_SDK_USR}/include/bzlib.h
-  mkdir -p ${NACL_SDK_USR}/lib
-  cp -f libbz2.a ${NACL_SDK_USR}/lib
-  chmod a+r ${NACL_SDK_USR}/lib/libbz2.a
+  mkdir -p ${NACLPORTS_PREFIX}/include
+  cp -f bzlib.h ${NACLPORTS_PREFIX}/include
+  chmod a+r ${NACLPORTS_PREFIX}/include/bzlib.h
+  mkdir -p ${NACLPORTS_PREFIX}/lib
+  cp -f libbz2.a ${NACLPORTS_PREFIX}/lib
+  chmod a+r ${NACLPORTS_PREFIX}/lib/libbz2.a
 
   DefaultTouchStep
 }
 
 CustomPackageInstall() {
   DefaultPreInstallStep
   DefaultDownloadStep
   DefaultExtractStep
   # bzip2 doesn't need patching, so no patch step
   CustomConfigureStep
   CustomBuildStep
   CustomInstallStep
   DefaultCleanUpStep
 }
 
 
 CustomPackageInstall
 exit 0