Issue #17591: Use lowercase filenames when including Windows header files.
Patch by Roumen Petrov.
diff --git a/Misc/ACKS b/Misc/ACKS
index 21f2cd5..7c7ad78 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -943,6 +943,7 @@
 Benjamin Peterson
 Joe Peterson
 Chris Petrilli
+Roumen Petrov
 Bjorn Pettersen
 Justin D. Pettit
 Ronny Pfannschmidt
diff --git a/Misc/NEWS b/Misc/NEWS
index 03b3c4f..9a64abb 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -1163,6 +1163,9 @@
 Build
 -----
 
+- Issue #17591: Use lowercase filenames when including Windows header files.
+  Patch by Roumen Petrov.
+
 - Issue #17550: Fix the --enable-profiling configure switch.
 
 - Issue #17425: Build with openssl 1.0.1d on Windows.
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index 0e91450..8b6c1c2 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -9,7 +9,7 @@
 #endif
 
 #ifdef MS_WINDOWS
-#include <Windows.h>
+#include <windows.h>
 #ifdef HAVE_PROCESS_H
 #include <process.h>
 #endif
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index 6b04700..79bbb8f 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -2327,7 +2327,7 @@
     }
 
 #ifdef MS_WINDOWS
-#include <Winsock2.h>
+#include <winsock2.h>
 /* The following constants were added to errno.h in VS2010 but have
    preferred WSA equivalents. */
 #undef EADDRINUSE