I am trying to install CLang from the source but getting unknown errors. The error is
make[2]: Leaving directory `/home/ram/Desktop/llvm/tools/llvmc'
make[2]: Entering directory `/home/ram/Desktop/llvm/tools/clang'
make[3]: Entering directory `/home/ram/Desktop/llvm/tools/clang/include'
make[4]: Entering directory `/home/ram/Desktop/llvm/tools/clang/include/clang'
make[5]: Entering directory `/home/ram/Desktop/llvm/tools/clang/include/clang/AST'
llvm[5]: Building Clang attribute classes with tblgen
tblgen: Unknown command line argument '-gen-clang-attr-classes'. Try: '/home/ram/Desktop/llvm/Release/bin/tblgen --help'
make[5]: *** [/home/ram/Desktop/llvm/tools/clang/include/clang/AST/Release/Attrs.inc.tmp] Error 1
make[5]: Leaving directory `/home/ram/Desktop/llvm/tools/clang/include/clang/AST'
make[4]: *** [all] Error 1
make[4]: Leaving directory `/home/ram/Desktop/llvm/tools/clang/include/clang'
make[3]: *** [all] Error 1
make[3]: Leaving directory `/home/ram/Desktop/llvm/tools/clang/include'
make[2]: *** [all] Error 1
make[2]: Leaving directory `/home/ram/Desktop/llvm/tools/clang'
make[1]: *** [clang/.makeall] Error 2
make[1]: Leaving directory `/home/ram/Desktop/llvm/tools'
make: *** [all] Error 1
What should I do to fix the error?