[docs] Remove references to autoconf build.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@259281 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/BuildingLibcxx.rst b/docs/BuildingLibcxx.rst
index f00ce4f..0173326 100644
--- a/docs/BuildingLibcxx.rst
+++ b/docs/BuildingLibcxx.rst
@@ -34,8 +34,7 @@
#. Configure and build libc++ with libc++abi:
- CMake is the only supported configuration system. Unlike other LLVM
- projects autotools is not supported for either libc++ or libc++abi.
+ CMake is the only supported configuration system.
Clang is the preferred compiler when building and using libc++.
