Allow re-targeting of naclports install

libraries/flac-1.2.1/nacl-flac-1.2.1.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-flac-1.2.1.sh
 #
 # usage:  nacl-flac-1.2.1.sh
 #
 # this script downloads, patches, and builds flac for Native Client 
 #
 
 readonly URL=http://commondatastorage.googleapis.com/nativeclient-mirror/nacl/flac-1.2.1.tar.gz
 #readonly URL=http://sourceforge.net/projects/flac/files/flac-src/\
 #flac-1.2.1-src/flac-1.2.1.tar.gz/download
 readonly PATCH_FILE=nacl-flac-1.2.1.patch
 readonly PACKAGE_NAME=flac-1.2.1
 
 source ../../build_tools/common.sh
 
 
 CustomConfigureStep() {
   Banner "Configuring ${PACKAGE_NAME}"
   # export the nacl tools
   export CC=${NACLCC}
   export CXX=${NACLCXX}
   export AR=${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_PREFIX}/lib/pkgconfig
+  export PKG_CONFIG_LIBDIR=${NACLPORTS_PREFIX}/lib
   export PATH=${NACL_BIN_PATH}:${PATH};
   export LIBS="-lnosys"
   ChangeDir ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
   Remove ${PACKAGE_NAME}-build
   MakeDir ${PACKAGE_NAME}-build
   ChangeDir ${PACKAGE_NAME}-build
   ../configure \
     --host=nacl \
     --disable-shared \
-    --prefix=${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_PREFIX}/lib \
+    --oldincludedir=${NACLPORTS_PREFIX}/include \
     --enable-sse \
     --disable-3dnow \
     --disable-altivec \
     --disable-thorough-tests \
     --disable-oggtest \
     --disable-xmms-plugin \
     --without-metaflac-test-files \
     --disable-asm-optimizations \
     --with-http=off \
     --with-html=off \
@@ skipping 36 matching lines @@
   CustomPostConfigureStep
   DefaultBuildStep
   CustomInstallStep
   DefaultCleanUpStep
 }
 
 
 CustomPackageInstall
 exit 0