Windows compiles! (w/Visual Studio 2012) That's about all it does, but it's a start.

ext/kissdb/kissdb.c

@@ -15,7 +15,12 @@
 
 #include <string.h>
 #include <stdlib.h>
-#include <inttypes.h>
+#include <stdint.h>
+
+#ifdef _WIN32
+#define fseeko _fseeki64
+#define ftello _ftelli64
+#endif
 
 #define KISSDB_HEADER_SIZE ((sizeof(uint64_t) * 3) + 4)
 
@@ -322,6 +327,8 @@ int KISSDB_Iterator_next(KISSDB_Iterator *dbi,void *kbuf,void *vbuf)
 
 #ifdef KISSDB_TEST
 
+#include <inttypes.h>
+
 int main(int argc,char **argv)
 {
 	uint64_t i,j;