diff --git a/poky/meta/classes/cmake.bbclass b/poky/meta/classes/cmake.bbclass
index 94ed806..8243f7c 100644
--- a/poky/meta/classes/cmake.bbclass
+++ b/poky/meta/classes/cmake.bbclass
@@ -70,15 +70,22 @@
 OECMAKE_TARGET_COMPILE ?= "all"
 OECMAKE_TARGET_INSTALL ?= "install"
 
+def map_host_os_to_system_name(host_os):
+    if host_os.startswith('mingw'):
+        return 'Windows'
+    if host_os.startswith('linux'):
+        return 'Linux'
+    return host_os
+
 # CMake expects target architectures in the format of uname(2),
 # which do not always match TARGET_ARCH, so all the necessary
 # conversions should happen here.
-def map_target_arch_to_uname_arch(target_arch):
-    if target_arch == "powerpc":
+def map_host_arch_to_uname_arch(host_arch):
+    if host_arch == "powerpc":
         return "ppc"
-    if target_arch == "powerpc64":
+    if host_arch == "powerpc64":
         return "ppc64"
-    return target_arch
+    return host_arch
 
 cmake_do_generate_toolchain_file() {
 	if [ "${BUILD_SYS}" = "${HOST_SYS}" ]; then
@@ -88,8 +95,8 @@
 # CMake system name must be something like "Linux".
 # This is important for cross-compiling.
 $cmake_crosscompiling
-set( CMAKE_SYSTEM_NAME `echo ${TARGET_OS} | sed -e 's/^./\u&/' -e 's/^\(Linux\).*/\1/'` )
-set( CMAKE_SYSTEM_PROCESSOR ${@map_target_arch_to_uname_arch(d.getVar('TARGET_ARCH'))} )
+set( CMAKE_SYSTEM_NAME ${@map_host_os_to_system_name(d.getVar('HOST_OS'))} )
+set( CMAKE_SYSTEM_PROCESSOR ${@map_host_arch_to_uname_arch(d.getVar('HOST_ARCH'))} )
 set( CMAKE_C_COMPILER ${OECMAKE_C_COMPILER} )
 set( CMAKE_CXX_COMPILER ${OECMAKE_CXX_COMPILER} )
 set( CMAKE_C_COMPILER_LAUNCHER ${OECMAKE_C_COMPILER_LAUNCHER} )