strawberry-patched $ cat DBD-Pg-3.7.4_patched.diff
diff -ru DBD-Pg-3.7.4/Pg.h DBD-Pg-3.7.4_patched/Pg.h
--- DBD-Pg-3.7.4/Pg.h   2018-02-04 17:02:47.000000000 +0100
+++ DBD-Pg-3.7.4_patched/Pg.h   2018-04-07 17:59:19.010783900 +0200
@@ -14,9 +14,11 @@
 static int errno;
 #include <string.h>
 #define strcasecmp(s1,s2) stricmp((s1), (s2))
+#ifndef __USE_MINGW_ANSI_STDIO
 #ifndef snprintf
 #define snprintf _snprintf
 #endif
+#endif
 #else
 #include <strings.h>
 #endif