diff --git a/llvm-gcc-4.2/build_gcc b/llvm-gcc-4.2/build_gcc
index 9f56c18..09d4250 100755
--- a/llvm-gcc-4.2/build_gcc
+++ b/llvm-gcc-4.2/build_gcc
@@ -133,6 +133,11 @@
 # If the Phone platform is available, use the ARM tools there, else try /
 if [ -d $ARM_PLATFORM ]; then
   ARM_TOOLROOT=$ARM_PLATFORM/Developer
+  # If it's being built for iPhoneOS, assume the llvmCore bits are under
+  # iPhoneOS platform directory.
+  if [ "x$RC_ProjectName" = "xllvmgcc42_Embedded" ]; then
+    LLVMCORE_PATH="${ARM_PLATFORM}${LLVMCORE_PATH}"
+  fi
 else
   ARM_TOOLROOT=/
 fi