Allow re-targeting of naclports install

libraries/SDL_mixer-1.2.11/nacl-SDL_mixer-1.2.11.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-SDL_mixer-1.2.11.sh
 #
 # usage:  nacl-SDL_mixer-1.2.11.sh
 #
 # this script downloads, patches, and builds SDL_mixer for Native Client
 #
 
 source pkg_info
 source ../../build_tools/common.sh
+set -x
 
 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_LIBDIR}/pkgconfig
+  export PKG_CONFIG_LIBDIR=${NACLPORTS_LIBDIR}
   # Adding target usr/bin for libmikmod-config
-  export PATH=${NACL_BIN_PATH}:${NACL_SDK_USR}/bin:${PATH};
+  export PATH=${NACL_BIN_PATH}:${NACLPORTS_PREFIX}/bin:${PATH};
   export LIBS="-lvorbisfile -lvorbis -logg -lm"
   ChangeDir ${NACL_PACKAGES_REPOSITORY}/${PACKAGE_NAME}
   Remove ${PACKAGE_NAME}-build
   MakeDir ${PACKAGE_NAME}-build
   cd ${PACKAGE_NAME}-build
   ../configure \
     --host=nacl \
     --disable-shared \
-    --prefix=${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_LIBDIR} \
+    --oldincludedir=${NACLPORTS_INCLUDE} \
     --${NACL_OPTION}-mmx \
     --${NACL_OPTION}-sse \
     --${NACL_OPTION}-sse2 \
     --${NACL_OPTION}-asm \
     --with-x=no \
     --disable-music-flac \
     --disable-music-mp3
 }
 
 
 CustomPackageInstall() {
   DefaultPreInstallStep
   DefaultDownloadStep
   DefaultExtractStep
   DefaultPatchStep
   CustomConfigureStep
   DefaultBuildStep
   DefaultInstallStep
   DefaultCleanUpStep
 }
 
 
 CustomPackageInstall
 exit 0