diff --git a/preview/CMakeLists.txt b/preview/CMakeLists.txt
index 20d8f11c..8fac07fa 100644
--- a/preview/CMakeLists.txt
+++ b/preview/CMakeLists.txt
@@ -34,7 +34,17 @@ ExternalProject_Add(libjpeg-turbo-project
         -DREQUIRE_SIMD:BOOL=OFF
         -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
         -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
-        -DCMAKE_INSTALL_LIBDIR:PATH=<INSTALL_DIR>/lib)
+        -DCMAKE_INSTALL_LIBDIR:PATH=<INSTALL_DIR>/lib
+        # An ExternalProject is a separate cmake invocation and inherits nothing, so without these
+        # it configures for the BUILD host: a cross build would link an x86_64 libjpeg.a into an
+        # aarch64 binary and only fail at the final link. Forward the toolchain file (empty when not
+        # cross-compiling, which cmake ignores) and the compilers, so it follows the parent build.
+        # libjpeg-turbo picks its own SIMD from the target arch, so NEON comes for free on aarch64
+        # and nasm is simply not consulted there.
+        -DCMAKE_TOOLCHAIN_FILE:FILEPATH=${CMAKE_TOOLCHAIN_FILE}
+        -DCMAKE_C_COMPILER:FILEPATH=${CMAKE_C_COMPILER}
+        -DCMAKE_SYSTEM_NAME:STRING=${CMAKE_SYSTEM_NAME}
+        -DCMAKE_SYSTEM_PROCESSOR:STRING=${CMAKE_SYSTEM_PROCESSOR})
 
 # Create the include dir up front so setting INTERFACE_INCLUDE_DIRECTORIES below does not fail.
 FILE(MAKE_DIRECTORY ${LIBJPEG_TURBO_INCLUDE_DIRS})