diff --git a/cmake/DefineTargetVariables.cmake b/cmake/DefineTargetVariables.cmake
new file mode 100644
index 0000000..ada0152
--- /dev/null
+++ b/cmake/DefineTargetVariables.cmake
@@ -0,0 +1,15 @@
+if(NOT COMMAND check_cxx_source_compiles)
+  include(CheckCXXSourceCompiles)
+endif()
+
+macro(define_target_variables)
+  check_cxx_source_compiles("int main() { return __i386__; }" i386)
+  check_cxx_source_compiles("int main() { return __s390__; }" s390)
+  check_cxx_source_compiles("int main() { return __PPC64__; }" PPC64)
+  check_cxx_source_compiles("int main() { return __x86_64__; }" x86_64)
+  check_cxx_source_compiles("int main() { return __arm__; }" ARM)
+  check_cxx_source_compiles("int main() { return __FreeBSD__; }" FreeBSD)
+  check_cxx_source_compiles("int main() { return __MINGW__; }" MINGW)
+  check_cxx_source_compiles("int main() { return __linux; }" LINUX)
+  check_cxx_source_compiles("int main() { return __APPLE__; }" OSX)
+endmacro()