Index: clang/tools/scan-build/libexec/ccc-analyzer
===================================================================
--- clang/tools/scan-build/libexec/ccc-analyzer
+++ clang/tools/scan-build/libexec/ccc-analyzer
@@ -72,7 +72,7 @@
 # If on OSX, use xcrun to determine the SDK root.
 my $UseXCRUN = 0;
 
-if (`uname -a` =~ m/Darwin/) {
+if (`uname -s` =~ m/Darwin/) {
   $DefaultCCompiler = 'clang';
   $DefaultCXXCompiler = 'clang++';
   # Older versions of OSX do not have xcrun to
@@ -80,7 +80,7 @@
   if (-x "/usr/bin/xcrun") {
     $UseXCRUN = 1;
   }
-} elsif (`uname -a` =~ m/OpenBSD/) {
+} elsif (`uname -s` =~ m/OpenBSD/) {
   $DefaultCCompiler = 'cc';
   $DefaultCXXCompiler = 'c++';
 } else {