need to include a lower-case windows.h for cross-compilation
diff --git a/loader/windows/icd_windows_envvars.c b/loader/windows/icd_windows_envvars.c
index 223604e..c68cab6 100644
--- a/loader/windows/icd_windows_envvars.c
+++ b/loader/windows/icd_windows_envvars.c
@@ -16,7 +16,7 @@
  * OpenCL is a trademark of Apple Inc. used under license by Khronos.
  */
 
-#include <Windows.h>
+#include <windows.h>
 
 char *khrIcd_getenv(const char *name) {
     char *retVal;