diff --git a/clang/www/get_started.html b/clang/www/get_started.html
index dda914a46904e..8e4d36640be73 100755
--- a/clang/www/get_started.html
+++ b/clang/www/get_started.html
@@ -86,13 +86,16 @@
On Unix-like Systems
- If you intend to use Clang's C++ support, you may need to tell it how
- to find your C++ standard library headers. In general, Clang will detect
- the best version of libstdc++ headers available and use them - it will
- look both for system installations of libstdc++ as well as installations
- adjacent to Clang itself. If your configuration fits neither of these
- scenarios, you can use the -DGCC_INSTALL_PREFIX cmake option
- to tell Clang where the gcc containing the desired libstdc++ is installed.
+ On Linux, you may need GCC runtime libraries (e.g. crtbeginS.o,
+ libstdc++.so) and libstdc++ headers. In general, Clang will detect
+ well-known GCC installation paths matching the target triple (configured at
+ build time (see clang --version); overriden by
+ --target=) and use the largest version. If your configuration fits
+ none of the standard scenarios, you can set --gcc-install-dir= to
+ the GCC installation directory (something like
+ /usr/lib/gcc/$triple/$major). If your GCC installation is under
+ /usr/lib/gcc but uses a different triple, you can set
+ --gcc-triple=$triple.
Try it out (assuming you add llvm/build/bin to your path):
diff --git a/openmp/docs/SupportAndFAQ.rst b/openmp/docs/SupportAndFAQ.rst
index afc532cd73eef..9e6974dfbb13d 100644
--- a/openmp/docs/SupportAndFAQ.rst
+++ b/openmp/docs/SupportAndFAQ.rst
@@ -279,11 +279,12 @@ Q: How to build an OpenMP offload capable compiler with an outdated host compile
Enabling the OpenMP runtime will perform a two-stage build for you.
If your host compiler is different from your system-wide compiler, you may need
-to set the CMake variable `GCC_INSTALL_PREFIX` so clang will be able to find the
-correct GCC toolchain in the second stage of the build.
+to set ``CMAKE_{C,CXX}_FLAGS`` like
+``--gcc-install-dir=/usr/lib/gcc/x86_64-linux-gnu/12`` so that clang will be
+able to find the correct GCC toolchain in the second stage of the build.
For example, if your system-wide GCC installation is too old to build LLVM and
-you would like to use a newer GCC, set the CMake variable `GCC_INSTALL_PREFIX`
+you would like to use a newer GCC, set ``--gcc-install-dir=``
to inform clang of the GCC installation you would like to use in the second stage.
Q: How can I include OpenMP offloading support in my CMake project?