The cygwin project recently switched to a new implementation of the
windows api, now using header files from the mingw-64 project. These
new header files are incompatible with the way cygwin.c included the
old headers: cygwin.c can be compiled using the new or the older (mingw)
headers, but different files must be included in different order for each
to work. The new headers are in use only for the current release series
(based upon the v1.7.x dll version). The previous release series using
the v1.5 dll is kept available but unmaintained for use on older versions
of Windows. So, patch cygwin.c to use the new include ordering only if
the dll version is 1.7 or higher.

Signed-off-by: Mark Levedahl <>
 Makefile        | 4 ++++
 compat/cygwin.c | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/Makefile b/Makefile
index f69979e..1cc5d96 100644
--- a/Makefile
+++ b/Makefile
@@ -1082,6 +1082,7 @@ ifeq ($(uname_O),Cygwin)
                NO_SYMLINK_HEAD = YesPlease
                NO_IPV6 = YesPlease
                OLD_ICONV = UnfortunatelyYes
+               V15_MINGW_HEADERS = YesPlease
        NO_THREAD_SAFE_PREAD = YesPlease
        NEEDS_LIBICONV = YesPlease
@@ -1889,6 +1890,9 @@ ifdef NO_REGEX
        COMPAT_CFLAGS += -Icompat/regex
        COMPAT_OBJS += compat/regex/regex.o
        COMPAT_CFLAGS += -Icompat/nedmalloc
diff --git a/compat/cygwin.c b/compat/cygwin.c
index dfe9b30..59d86e4 100644
--- a/compat/cygwin.c
+++ b/compat/cygwin.c
@@ -1,6 +1,13 @@
 #define WIN32_LEAN_AND_MEAN
 #include "../git-compat-util.h"
 #include "win32.h"
+#include <sys/stat.h>
+#include <sys/errno.h>
+#include "win32.h"
+#include "../git-compat-util.h"
 #include "../cache.h" /* to read configuration */
 static inline void filetime_to_timespec(const FILETIME *ft, struct timespec 

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