+# Always build trace, identity, softpipe, and llvmpipe (where possible)
+if 'trace' not in env['drivers']:
+ env['drivers'].append('trace')
+if 'identity' not in env['drivers']:
+ env['drivers'].append('identity')
+if 'softpipe' not in env['drivers']:
+ env['drivers'].append('softpipe')
+if env['llvm'] and 'llvmpipe' not in env['drivers']:
+ env['drivers'].append('llvmpipe')
+