diff --git a/clang-tools-extra/pseudo/include/CMakeLists.txt b/clang-tools-extra/pseudo/include/CMakeLists.txt
--- a/clang-tools-extra/pseudo/include/CMakeLists.txt
+++ b/clang-tools-extra/pseudo/include/CMakeLists.txt
@@ -1,7 +1,13 @@
 # The cxx.bnf grammar file
 set(cxx_bnf ${CMAKE_CURRENT_SOURCE_DIR}/../lib/cxx.bnf)
 
-if(LLVM_USE_HOST_TOOLS)
+set(PSEUDO_GEN "pseudo-gen" CACHE
+  STRING "Host pseudo-gen executable. Saves building one if cross-compiling.")
+
+if(NOT PSEUDO_GEN STREQUAL "pseudo-gen")
+  set(pseudo_gen ${PSEUDO_GEN})
+  set(pseudo_gen_target ${PSEUDO_GEN})
+elseif(LLVM_USE_HOST_TOOLS)
   build_native_tool(pseudo-gen pseudo_gen)
   set(pseudo_gen_target "${pseudo_gen}")
 else()