diff --git a/libcxxabi/CMakeLists.txt b/libcxxabi/CMakeLists.txt
--- a/libcxxabi/CMakeLists.txt
+++ b/libcxxabi/CMakeLists.txt
@@ -270,6 +270,12 @@
 
 if (LIBCXXABI_HAS_NOSTDINCXX_FLAG)
   list(APPEND LIBCXXABI_COMPILE_FLAGS -nostdinc++)
+  # Recent versions of cmake have a behaviour where system include paths are
+  # detected and removed from user flags.  Here we build with -nostdinc++ and
+  # explictly add libcxx (system) include paths with -I on the command line.
+  # Setting CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES effecticly prevents cmake
+  # from removing these.
+  set(CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES "")
   # Remove -stdlib flags to prevent them from causing an unused flag warning.
   string(REPLACE "-stdlib=libc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
   string(REPLACE "-stdlib=libstdc++" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")