Allow re-targeting of naclports install

libraries/ImageMagick-6.5.4-10/nacl-ImageMagick-6.5.4-10.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-ImageMagick-6.5.4-10.sh
 #
 # usage:  nacl-ImageMagick-6.5.4-10.sh
 #
 # this script downloads, patches, and builds ImageMagick for Native Client
 #
 
 source pkg_info
 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_LIBDIR}/pkgconfig
+  export PKG_CONFIG_LIBDIR=${NACLPORTS_LIBDIR}
   export PATH=${NACL_BIN_PATH}:${PATH};
   # Drop /opt/X11/bin (may interfere build on osx).
   export PATH=$(echo $PATH | sed -e 's;/opt/X11/bin;;')
   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} \
     --with-x=no \
     --disable-largefile \
     --without-fftw
 }
 
 
 CustomBuildAndInstallStep() {
   # assumes pwd has makefile
   make clean
-  make CFLAGS='-DSSIZE_MAX="((ssize_t)(~((size_t)0)>>1))"' \
-    install-libLTLIBRARIES install-data-am -j${OS_JOBS}
+  cflags="${NACLPORTS_CFLAGS} -DSSIZE_MAX=\"((ssize_t)(~((size_t)0)>>1))\""
+  make CFLAGS="${cflags}" install-libLTLIBRARIES install-data-am -j${OS_JOBS}
   DefaultTouchStep
 }
 
 
 CustomPackageInstall() {
   DefaultPreInstallStep
   DefaultDownloadStep
   DefaultExtractStep
   DefaultPatchStep
   CustomConfigureStep
   CustomBuildAndInstallStep
   DefaultCleanUpStep
 }
 
 CustomPackageInstall
 exit 0