Update OS X installer build target compilers.
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index 9f8d025..1a16165 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -137,8 +137,10 @@
 target_cc_map = {
         '10.3': 'gcc-4.0',
         '10.4': 'gcc-4.0',
-        '10.5': 'gcc-4.0',
+        '10.5': 'gcc-4.2',
         '10.6': 'gcc-4.2',
+        '10.7': 'clang',
+        '10.8': 'clang',
 }
 
 CC = target_cc_map[DEPTARGET]