diff --git a/CMakeLists.txt b/CMakeLists.txt
index bf6929f..3d24caf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,6 +52,8 @@ set(JSON_C_HEADERS
     ./linkhash.h
     ./math_compat.h
     ./strdup_compat.h
+	./strerror_override.h
+	./strerror_override_private.h
     ./vasprintf_compat.h
     ./printbuf.h
     ./random_seed.h
@@ -66,6 +68,7 @@ set(JSON_C_SOURCES
     ./json_util.c
     ./linkhash.c
     ./printbuf.c
+	./strerror_override.c
     ./random_seed.c
     ./strerror_override.c
 )
diff --git a/json_object.c b/json_object.c
index ec4e2b6..01ee0a8 100644
--- a/json_object.c
+++ b/json_object.c
@@ -459,13 +459,15 @@ int json_object_object_add_ex(struct json_object* jso,
 	struct json_object *const val,
 	const unsigned opts)
 {
+	struct json_object *existing_value = NULL;
+	struct lh_entry *existing_entry;
+	unsigned long hash;
+
 	assert(json_object_get_type(jso) == json_type_object);
 
 	// We lookup the entry and replace the value, rather than just deleting
 	// and re-adding it, so the existing key remains valid.
-	json_object *existing_value = NULL;
-	struct lh_entry *existing_entry;
-	const unsigned long hash = lh_get_hash(jso->o.c_object, (const void *)key);
+	hash = lh_get_hash(jso->o.c_object, (const void *)key);
 	existing_entry = (opts & JSON_C_OBJECT_ADD_KEY_IS_NEW) ? NULL : 
 			      lh_table_lookup_entry_w_hash(jso->o.c_object,
 							   (const void *)key, hash);
@@ -851,11 +853,12 @@ struct json_object* json_object_new_double(double d)
 
 struct json_object* json_object_new_double_s(double d, const char *ds)
 {
+	char *new_ds;
 	struct json_object *jso = json_object_new_double(d);
 	if (!jso)
 		return NULL;
 
-	char *new_ds = strdup(ds);
+	new_ds = strdup(ds);
 	if (!new_ds)
 	{
 		json_object_generic_delete(jso);
@@ -1035,8 +1038,8 @@ int json_object_set_string(json_object* jso, const char* s) {
 }
 
 int json_object_set_string_len(json_object* jso, const char* s, int len){
-	if (jso==NULL || jso->o_type!=json_type_string) return 0; 	
 	char *dstbuf; 
+	if (jso==NULL || jso->o_type!=json_type_string) return 0; 	
 	if (len<LEN_DIRECT_STRING_DATA) {
 		dstbuf=jso->o.c_string.str.data;
 		if (jso->o.c_string.len>=LEN_DIRECT_STRING_DATA) free(jso->o.c_string.str.ptr); 
diff --git a/json_tokener.c b/json_tokener.c
index 56b6c07..57d8367 100644
--- a/json_tokener.c
+++ b/json_tokener.c
@@ -387,10 +387,11 @@ struct json_object* json_tokener_parse_ex(struct json_tokener *tok,
       {
 	size_t size_inf;
 	int is_negative = 0;
+	char *infbuf;
 
 	printbuf_memappend_fast(tok->pb, &c, 1);
 	size_inf = json_min(tok->st_pos+1, json_inf_str_len);
-	char *infbuf = tok->pb->buf;
+	infbuf = tok->pb->buf;
 	if (*infbuf == '-')
 	{
 		infbuf++;
diff --git a/linkhash.c b/linkhash.c
index 5497061..f68ff6f 100644
--- a/linkhash.c
+++ b/linkhash.c
@@ -560,6 +560,13 @@ int lh_table_resize(struct lh_table *t, int new_size)
 	return 0;
 }
 
+#if defined(_MSC_VER) && (_MSC_VER < 1900)
+unsigned long lh_get_hash(const struct lh_table *t, const void *k)
+{
+	return t->hash_fn(k);
+}
+#endif
+
 void lh_table_free(struct lh_table *t)
 {
 	struct lh_entry *c;
diff --git a/linkhash.h b/linkhash.h
index a606345..9080a72 100644
--- a/linkhash.h
+++ b/linkhash.h
@@ -332,10 +332,14 @@ int lh_table_resize(struct lh_table *t, int new_size);
  * @param k a pointer to the key to lookup
  * @return the key's hash
  */
-static inline unsigned long lh_get_hash(const struct lh_table *t, const void *k)
-{
-	return t->hash_fn(k);
+#if !defined(_MSC_VER) || (_MSC_VER > 1800)
+static inline unsigned long lh_get_hash(const struct lh_table *t, const void *k)
+{
+	return t->hash_fn(k);
 }
+#else
+unsigned long lh_get_hash(const struct lh_table *t, const void *k);
+#endif
 
 /* Don't use this outside of linkhash.h: */
 #ifdef __UNCONST
diff --git a/random_seed.c b/random_seed.c
index cb086d3..3232777 100644
--- a/random_seed.c
+++ b/random_seed.c
@@ -186,11 +186,11 @@ static int get_dev_random_seed()
 
 static int get_cryptgenrandom_seed()
 {
-    DEBUG_SEED("get_cryptgenrandom_seed");
-
     HCRYPTPROV hProvider = 0;
     int r;
 
+    DEBUG_SEED("get_cryptgenrandom_seed");
+
     if (!CryptAcquireContextW(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
         fprintf(stderr, "error CryptAcquireContextW");
         exit(1);