diff --git a/CMakeLists.txt b/CMakeLists.txt
index 674c40f4..e1c5aa6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -82,6 +82,59 @@ if(MSVC)
         string(REPLACE "/MD" "/MT" CMAKE_C_FLAGS_RELEASE ${CMAKE_C_FLAGS_RELEASE})
     endif()
 else()
+# detect host arch.
+    execute_process(COMMAND ${CMAKE_C_COMPILER} -dM -E -
+        INPUT_FILE /dev/null
+        OUTPUT_VARIABLE UC_COMPILER_MACRO)
+    while(TRUE)
+        string(FIND ${UC_COMPILER_MACRO} "__x86_64__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "i386")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "__i386__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "i386")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "__arm__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "arm")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "__aarch64__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "aarch64")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "__mips__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "mips")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "__sparc__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "sparc")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "__ia64__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "ia64")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "_ARCH_PPC" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "ppc")
+            break()
+        endif()
+        string(FIND ${UC_COMPILER_MACRO} "__s390__" UC_RET)
+        if (${UC_RET} GREATER "0")
+            set(UNICORN_TARGET_ARCH "s390")
+            break()
+        endif()
+        message(FATAL_ERROR "Unknown host compiler: ${CMAKE_C_COMPILER}.")
+    endwhile(TRUE)
+
 # check python
     find_program(PYTHON_CMD python)
     if (NOT PYTHON_CMD)
@@ -219,7 +272,7 @@ else()
         -c -o ${CMAKE_BINARY_DIR} -b -i ${CMAKE_CURRENT_SOURCE_DIR}/qemu/qapi-schema.json
     )
     add_compile_options(
-        -I${CMAKE_CURRENT_SOURCE_DIR}/qemu/tcg/i386
+        -I${CMAKE_CURRENT_SOURCE_DIR}/qemu/tcg/${UNICORN_TARGET_ARCH}
         -D_GNU_SOURCE
         -D_FILE_OFFSET_BITS=64
         -D_LARGEFILE_SOURCE