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-rw-r--r--git-compat-util.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/git-compat-util.h b/git-compat-util.h
index 7d3db43f11..3da9f975e2 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -127,7 +127,9 @@
/* Approximation of the length of the decimal representation of this type. */
#define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
-#if defined(__sun__)
+#ifdef __MINGW64__
+#define _POSIX_C_SOURCE 1
+#elif defined(__sun__)
/*
* On Solaris, when _XOPEN_EXTENDED is set, its header file
* forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE