Our default compilers are cc/c++.

Index: tools/clang/tools/scan-build/libexec/ccc-analyzer
--- tools/clang/tools/scan-build/libexec/ccc-analyzer.orig
+++ tools/clang/tools/scan-build/libexec/ccc-analyzer
@@ -84,8 +84,8 @@ if (`uname -a` =~ m/Darwin/) {
   $DefaultCCompiler = 'cc';
   $DefaultCXXCompiler = 'c++';
 } else {
-  $DefaultCCompiler = 'gcc';
-  $DefaultCXXCompiler = 'g++';
+  $DefaultCCompiler = 'cc';
+  $DefaultCXXCompiler = 'c++';
 }
 
 if ($FindBin::Script =~ /c\+\+-analyzer/) {
