diff --git a/mac_build/BuildMacBOINC.sh b/mac_build/BuildMacBOINC.sh
index 175248e3c4..e65b60bb1b 100644
--- a/mac_build/BuildMacBOINC.sh
+++ b/mac_build/BuildMacBOINC.sh
@@ -27,6 +27,7 @@
 # Updated 7/9/12 for Xcode 4.3 and later which are not at a fixed address
 # Updated 2/7/14 to also build libboinc_zip.a
 # Updated 11/28/15 to build ScreenSaver with ARC under Xcode 6 or later
+# Updated 2/3/16 to allow optional use of libc++ and C++11 dialect
 #
 ## This script requires OS 10.8 or later
 #
@@ -52,6 +53,10 @@
 ## -noclean     don't do a "clean" of each target before building.
 ##              default is to clean all first.
 ##
+## -libc++      build using libc++ instead of libstdc++ (requires OS 10.7)
+##
+## -c++11       build using c++11 language dialect instead of default (requires libc++)
+##
 ##  The following arguments determine which targets to build
 ##
 ## -all         build all targets (i.e. target "Build_All" -- this is the default)
@@ -68,6 +73,8 @@
 
 targets=""
 doclean="clean"
+cplusplus11dialect=""
+uselibcplusplus=""
 buildall=0
 buildlibs=0
 buildclient=0
@@ -85,6 +92,8 @@ while [ $# -gt 0 ]; do
   case "$1" in 
     -noclean ) doclean="" ; shift 1 ;;
     -dev ) style="Development" ; shift 1 ;;
+    -libc++ ) uselibcplusplus="CLANG_CXX_LIBRARY=libc++ MACOSX_DEPLOYMENT_TARGET=10.7" ; shift 1 ;;
+    -c++11 ) cplusplus11dialect="CLANG_CXX_LANGUAGE_STANDARD=c++11" ; shift 1 ;;
     -all ) buildall=1 ; shift 1 ;;
     -lib ) buildlibs=1 ; shift 1 ;;
     -client ) buildclient=1 ; shift 1 ;;
@@ -151,28 +160,28 @@ SDKPATH=`xcodebuild -version -sdk macosx Path`
 if [ $isXcode6orLater = 0 ]; then
     ## echo "Xcode version < 6"
     ## Build the screensaver using our standard settings (with Garbage Collection)
-    xcodebuild -project boinc.xcodeproj ${targets} -configuration ${style} -sdk "${SDKPATH}" ${doclean} build
+    xcodebuild -project boinc.xcodeproj ${targets} -configuration ${style} -sdk "${SDKPATH}" ${doclean} build ${uselibcplusplus} ${cplusplus11dialect}
 else
     ## echo "Xcode version > 5"
     ## We must modify the build settings for the screensaver only, to build it with ARC
-    xcodebuild -project boinc.xcodeproj ${targets} -configuration ${style} -sdk "${SDKPATH}" ${doclean}  build
+    xcodebuild -project boinc.xcodeproj ${targets} -configuration ${style} -sdk "${SDKPATH}" ${doclean}  build ${uselibcplusplus} ${cplusplus11dialect}
 
     result=$?
 
-    if [ $result -eq 0 ]; then
-        xcodebuild -project boinc.xcodeproj -target ScreenSaver -configuration ${style} -sdk "${SDKPATH}" ${doclean} build ARCHS=x86_64 GCC_ENABLE_OBJC_GC=unsupported
+    if [ "${buildall}" = "1" ] || [ "${targets}" = "" ]; then
+        if [ $result -eq 0 ]; then
+            xcodebuild -project boinc.xcodeproj -target ScreenSaver -configuration ${style} -sdk "${SDKPATH}" ${doclean} build ARCHS=x86_64 GCC_ENABLE_OBJC_GC=unsupported ${uselibcplusplus} ${cplusplus11dialect}
+        fi
     fi
 fi
 
-
-
 result=$?
 
 if [ $result -eq 0 ]; then
     # build ibboinc_zip.a for -all or -lib or default, where
     # default is none of { -all, -lib, -client }
     if [ "${buildall}" = "1" ] || [ "${buildlibs}" = "1" ] || [ "${buildclient}" = "0" ]; then
-        xcodebuild -project ../zip/boinc_zip.xcodeproj -target boinc_zip -configuration ${style} -sdk "${SDKPATH}" ${doclean} build
+        xcodebuild -project ../zip/boinc_zip.xcodeproj -target boinc_zip -configuration ${style} -sdk "${SDKPATH}" ${doclean} build  ${uselibcplusplus} ${cplusplus11dialect}
 
         result=$?
     fi