diff --git a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
--- a/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn
@@ -50,7 +50,7 @@
 
   # glibc is at least 2.33 which has mallinfo2.
   # TODO: remove this once nobody using the gn build is building against an old glibc.
-  llvm_have_mallinfo2 = false
+  llvm_have_mallinfo2 = true
 }
 
 write_cmake_config("abi-breaking") {