diff --git a/lang/c/CMakeLists.txt b/lang/c/CMakeLists.txt
index 11cbf018..1bef3ba2 100644
--- a/lang/c/CMakeLists.txt
+++ b/lang/c/CMakeLists.txt
@@ -161,27 +161,27 @@ else (SNAPPY_FOUND AND ZLIB_FOUND)
     message("Disabled snappy codec. libsnappy not found or zlib not found.")
 endif (SNAPPY_FOUND AND ZLIB_FOUND)
 
-find_package(PkgConfig)
-pkg_check_modules(LZMA liblzma)
-if (LZMA_FOUND)
+find_package(LIBLZMA)
+if (LIBLZMA_FOUND)
     set(LZMA_PKG liblzma)
     add_definitions(-DLZMA_CODEC)
-    include_directories(${LZMA_INCLUDE_DIRS})
-    link_directories(${LZMA_LIBRARY_DIRS})
+    include_directories(${LIBLZMA_INCLUDE_DIRS})
+    link_directories(${LIBLZMA_LIBRARY_DIRS})
     message("Enabled lzma codec")
-else (LZMA_FOUND)
+else (LIBLZMA_FOUND)
     set(LZMA_PKG "")
     set(LZMA_LIBRARIES "")
     message("Disabled lzma codec. liblzma not found.")
-endif (LZMA_FOUND)
+endif (LIBLZMA_FOUND)
 
-set(CODEC_LIBRARIES ${ZLIB_LIBRARIES} ${LZMA_LIBRARIES} ${SNAPPY_LIBRARIES})
+set(CODEC_LIBRARIES ${ZLIB_LIBRARIES} ${LIBLZMA_LIBRARIES} ${SNAPPY_LIBRARIES})
 set(CODEC_PKG "@ZLIB_PKG@ @LZMA_PKG@ @SNAPPY_PKG@")
 
 # Jansson JSON library
-pkg_check_modules(JANSSON jansson>=2.3)
+find_package(JANSSON REQUIRED)
 if (JANSSON_FOUND)
     set(JANSSON_PKG libjansson)
+    set(JANSSON_LIBRARIES jansson::jansson)
     include_directories(${JANSSON_INCLUDE_DIRS})
     link_directories(${JANSSON_LIBRARY_DIRS})
 else (JANSSON_FOUND)
diff --git a/lang/c/examples/quickstop.c b/lang/c/examples/quickstop.c
index f18225b7..78e2b1b8 100644
--- a/lang/c/examples/quickstop.c
+++ b/lang/c/examples/quickstop.c
@@ -16,6 +16,7 @@
  */
 
 #include <avro.h>
+#include <avro/platform.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -102,7 +103,7 @@ int print_person(avro_file_reader_t db, avro_schema_t reader_schema)
 
 		if (avro_record_get(person, "ID", &id_datum) == 0) {
 			avro_int64_get(id_datum, &i64);
-			fprintf(stdout, "%"PRId64" | ", i64);
+			fprintf(stdout, "%" PRId64 " | ", i64);
 		}
 		if (avro_record_get(person, "First", &first_datum) == 0) {
 			avro_string_get(first_datum, &p);
diff --git a/lang/c/src/avro/msinttypes.h b/lang/c/src/avro/msinttypes.h
index 29be14b9..7efc7026 100644
--- a/lang/c/src/avro/msinttypes.h
+++ b/lang/c/src/avro/msinttypes.h
@@ -54,6 +54,10 @@
 
 // 7.8 Format conversion of integer types
 
+#if (_MSC_VER >= 1900)
+#   include <inttypes.h>
+#else
+
 typedef struct {
    intmax_t quot;
    intmax_t rem;
@@ -311,5 +315,6 @@ imaxdiv_t __cdecl imaxdiv(intmax_t numer, intmax_t denom)
 #define wcstoimax _wcstoi64
 #define wcstoumax _wcstoui64
 
+#endif // (_MSC_VER >= 1900)
 
 #endif // _MSC_INTTYPES_H_ ]
diff --git a/lang/c/src/avro/msstdint.h b/lang/c/src/avro/msstdint.h
index d02608a5..54e8972c 100644
--- a/lang/c/src/avro/msstdint.h
+++ b/lang/c/src/avro/msstdint.h
@@ -42,6 +42,10 @@
 
 #include <limits.h>
 
+#if (_MSC_VER >= 1900)
+#   include <stdint.h>
+#else
+
 // For Visual Studio 6 in C++ mode and for many Visual Studio versions when
 // compiling for ARM we should wrap <wchar.h> include with 'extern "C++" {}'
 // or compiler give many errors like this:
@@ -243,5 +247,6 @@ typedef uint64_t  uintmax_t;
 
 #endif // __STDC_CONSTANT_MACROS ]
 
+#endif // (_MSC_VER >= 1900)
 
 #endif // _MSC_STDINT_H_ ]
diff --git a/lang/c/src/avro/platform.h b/lang/c/src/avro/platform.h
index 92930550..edfe1e05 100644
--- a/lang/c/src/avro/platform.h
+++ b/lang/c/src/avro/platform.h
@@ -35,8 +35,10 @@ extern "C" {
 // Defines for printing size_t.
 #if defined(_WIN64)
   #define PRIsz PRIu64
+  typedef __int64  ssize_t;
 #elif defined(_WIN32)
   #define PRIsz PRIu32
+  typedef long   ssize_t;
 #else // GCC
   #define PRIsz "zu"
 #endif
diff --git a/lang/c/src/avro_private.h b/lang/c/src/avro_private.h
index f97ef6b5..6b291048 100644
--- a/lang/c/src/avro_private.h
+++ b/lang/c/src/avro_private.h
@@ -34,7 +34,7 @@ extern "C" {
 #endif
 
 #ifdef _WIN32
-#define snprintf _snprintf
+ // #define snprintf _snprintf
 #endif
 
 /* Note that AVRO_PLATFORM_IS_BIG_ENDIAN is *always* defined. It is
diff --git a/lang/c/src/avroappend.c b/lang/c/src/avroappend.c
index 7243c600..39656ff4 100644
--- a/lang/c/src/avroappend.c
+++ b/lang/c/src/avroappend.c
@@ -20,7 +20,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #ifdef _WIN32
-#include <unistd.h>
+#include <io.h>
 #endif
 
 #include "avro.h"
diff --git a/lang/c/src/codec.c b/lang/c/src/codec.c
index 5b55b351..49789f2b 100644
--- a/lang/c/src/codec.c
+++ b/lang/c/src/codec.c
@@ -269,7 +269,7 @@ static int encode_deflate(avro_codec_t c, void * data, int64_t len)
 	s->next_in = (Bytef*)data;
 	s->avail_in = (uInt)len;
 
-	s->next_out = c->block_data;
+	s->next_out = (Bytef*)c->block_data;
 	s->avail_out = (uInt)c->block_size;
 
 	s->total_out = 0;
@@ -313,10 +313,10 @@ static int decode_deflate(avro_codec_t c, void * data, int64_t len)
 
 	c->used_size = 0;
 
-	s->next_in = data;
+	s->next_in = (Bytef*)data;
 	s->avail_in = len;
 
-	s->next_out = c->block_data;
+	s->next_out = (Bytef*)c->block_data;
 	s->avail_out = c->block_size;
 
 	s->total_out = 0;
@@ -337,7 +337,7 @@ static int decode_deflate(avro_codec_t c, void * data, int64_t len)
 		if (err == Z_BUF_ERROR)
 		{
 			c->block_data = avro_realloc(c->block_data, c->block_size, c->block_size * 2);
-			s->next_out = c->block_data + s->total_out;
+			s->next_out = (Bytef*)c->block_data + s->total_out;
 			s->avail_out += c->block_size;
 			c->block_size = c->block_size * 2;
 		}
@@ -440,7 +440,7 @@ static int encode_lzma(avro_codec_t codec, void * data, int64_t len)
 		return 1;
 	}
 
-	ret = lzma_raw_buffer_encode(filters, NULL, data, len, codec->block_data, &written, codec->block_size);
+	ret = lzma_raw_buffer_encode(filters, NULL, (const uint8_t*)data, len, (uint8_t*)codec->block_data, &written, codec->block_size);
 
 	codec->used_size = written;
 
@@ -471,8 +471,8 @@ static int decode_lzma(avro_codec_t codec, void * data, int64_t len)
 
 	do
 	{
-		ret = lzma_raw_buffer_decode(filters, NULL, data,
-			&read_pos, len, codec->block_data, &write_pos,
+		ret = lzma_raw_buffer_decode(filters, NULL, (const uint8_t*)data,
+			&read_pos, len, (uint8_t*)codec->block_data, &write_pos,
 			codec->block_size);
 
 		codec->used_size = write_pos;
diff --git a/lang/c/src/schema.c b/lang/c/src/schema.c
index 7b389002..50fa0db6 100644
--- a/lang/c/src/schema.c
+++ b/lang/c/src/schema.c
@@ -74,7 +74,7 @@ static int is_avro_id(const char *name)
  * namespace (as a newly allocated buffer using Avro's allocator). */
 static char *split_namespace_name(const char *fullname, const char **name_out)
 {
-	char *last_dot = strrchr(fullname, '.');
+	const char *last_dot = strrchr(fullname, '.');
 	if (last_dot == NULL) {
 		*name_out = fullname;
 		return NULL;
@@ -770,12 +770,12 @@ avro_schema_t avro_schema_link_target(avro_schema_t schema)
 }
 
 static const char *
-qualify_name(const char *name, const char *namespace)
+qualify_name(const char *name, const char *namespaceX)
 {
 	char *full_name;
-	if (namespace != NULL && strchr(name, '.') == NULL) {
-		full_name = avro_str_alloc(strlen(name) + strlen(namespace) + 2);
-		sprintf(full_name, "%s.%s", namespace, name);
+	if (namespaceX != NULL && strchr(name, '.') == NULL) {
+		full_name = avro_str_alloc(strlen(name) + strlen(namespaceX) + 2);
+		sprintf(full_name, "%s.%s", namespaceX, name);
 	} else {
 		full_name = avro_strdup(name);
 	}
@@ -786,20 +786,20 @@ static int
 save_named_schemas(const avro_schema_t schema, st_table *st)
 {
 	const char *name = avro_schema_name(schema);
-	const char *namespace = avro_schema_namespace(schema);
-	const char *full_name = qualify_name(name, namespace);
+	const char *namespaceX = avro_schema_namespace(schema);
+	const char *full_name = qualify_name(name, namespaceX);
 	int rval = st_insert(st, (st_data_t) full_name, (st_data_t) schema);
 	return rval;
 }
 
 static avro_schema_t
-find_named_schemas(const char *name, const char *namespace, st_table *st)
+find_named_schemas(const char *name, const char *namespaceX, st_table *st)
 {
 	union {
 		avro_schema_t schema;
 		st_data_t data;
 	} val;
-	const char *full_name = qualify_name(name, namespace);
+	const char *full_name = qualify_name(name, namespaceX);
 	int rval = st_lookup(st, (st_data_t) full_name, &(val.data));
 	avro_str_free((char *)full_name);
 	if (rval) {
@@ -812,7 +812,7 @@ find_named_schemas(const char *name, const char *namespace, st_table *st)
 static int
 avro_type_from_json_t(json_t *json, avro_type_t *type,
 		      st_table *named_schemas, avro_schema_t *named_type,
-		      const char *namespace)
+		      const char *namespaceX)
 {
 	json_t *json_type;
 	const char *type_str;
@@ -863,7 +863,7 @@ avro_type_from_json_t(json_t *json, avro_type_t *type,
 		*type = AVRO_MAP;
 	} else if (strcmp(type_str, "fixed") == 0) {
 		*type = AVRO_FIXED;
-	} else if ((*named_type = find_named_schemas(type_str, namespace, named_schemas))) {
+	} else if ((*named_type = find_named_schemas(type_str, namespaceX, named_schemas))) {
 		*type = AVRO_LINK;
 	} else {
 		avro_set_error("Unknown Avro \"type\": %s", type_str);
@@ -954,15 +954,15 @@ avro_schema_from_json_t(json_t *json, avro_schema_t *schema,
 			}
 
 			if (strchr(fullname, '.')) {
-				char *namespace = split_namespace_name(fullname, &name);
-				*schema = avro_schema_record(name, namespace);
-				avro_str_free(namespace);
+				char *namespaceX = split_namespace_name(fullname, &name);
+				*schema = avro_schema_record(name, namespaceX);
+				avro_str_free(namespaceX);
 			} else if (json_is_string(json_namespace)) {
-				const char *namespace = json_string_value(json_namespace);
-				if (strlen(namespace) == 0) {
-					namespace = NULL;
+				const char *namespaceX = json_string_value(json_namespace);
+				if (strlen(namespaceX) == 0) {
+					namespaceX = NULL;
 				}
-				*schema = avro_schema_record(fullname, namespace);
+				*schema = avro_schema_record(fullname, namespaceX);
 			} else {
 				*schema = avro_schema_record(fullname, parent_namespace);
 			}
@@ -1053,16 +1053,16 @@ avro_schema_from_json_t(json_t *json, avro_schema_t *schema,
 			}
 
 			if (strchr(fullname, '.')) {
-				char *namespace;
-				namespace = split_namespace_name(fullname, &name);
-				*schema = avro_schema_enum_ns(name, namespace);
-				avro_str_free(namespace);
+				char *namespaceX;
+				namespaceX = split_namespace_name(fullname, &name);
+				*schema = avro_schema_enum_ns(name, namespaceX);
+				avro_str_free(namespaceX);
 			} else if (json_is_string(json_namespace)) {
-				const char *namespace = json_string_value(json_namespace);
-				if (strlen(namespace) == 0) {
-					namespace = NULL;
+				const char *namespaceX = json_string_value(json_namespace);
+				if (strlen(namespaceX) == 0) {
+					namespaceX = NULL;
 				}
-				*schema = avro_schema_enum_ns(fullname, namespace);
+				*schema = avro_schema_enum_ns(fullname, namespaceX);
 			} else {
 				*schema = avro_schema_enum_ns(fullname, parent_namespace);
 			}
@@ -1190,16 +1190,16 @@ avro_schema_from_json_t(json_t *json, avro_schema_t *schema,
 			fullname = json_string_value(json_name);
 
 			if (strchr(fullname, '.')) {
-				char *namespace;
-				namespace = split_namespace_name(fullname, &name);
-				*schema = avro_schema_fixed_ns(name, namespace, (int64_t) size);
-				avro_str_free(namespace);
+				char *namespaceX;
+				namespaceX = split_namespace_name(fullname, &name);
+				*schema = avro_schema_fixed_ns(name, namespaceX, (int64_t) size);
+				avro_str_free(namespaceX);
 			} else if (json_is_string(json_namespace)) {
-				const char *namespace = json_string_value(json_namespace);
-				if (strlen(namespace) == 0) {
-					namespace = NULL;
+				const char *namespaceX = json_string_value(json_namespace);
+				if (strlen(namespaceX) == 0) {
+					namespaceX = NULL;
 				}
-				*schema = avro_schema_fixed_ns(fullname, namespace, (int64_t) size);
+				*schema = avro_schema_fixed_ns(fullname, namespaceX, (int64_t) size);
 			} else {
 				*schema = avro_schema_fixed_ns(fullname, parent_namespace, (int64_t) size);
 			}
@@ -1821,9 +1821,9 @@ static int write_link(avro_writer_t out, const struct avro_link_schema_t *link,
 {
 	int rval;
 	check(rval, avro_write_str(out, "\""));
-	const char *namespace = avro_schema_namespace(link->to);
-	if (namespace && nullstrcmp(namespace, parent_namespace)) {
-		check(rval, avro_write_str(out, namespace));
+	const char *namespaceX = avro_schema_namespace(link->to);
+	if (namespaceX && nullstrcmp(namespaceX, parent_namespace)) {
+		check(rval, avro_write_str(out, namespaceX));
 		check(rval, avro_write_str(out, "."));
 	}
 	check(rval, avro_write_str(out, avro_schema_name(link->to)));
diff --git a/lang/c/tests/test_avro_data.c b/lang/c/tests/test_avro_data.c
index 1da09e6d..7ef26013 100644
--- a/lang/c/tests/test_avro_data.c
+++ b/lang/c/tests/test_avro_data.c
@@ -112,7 +112,7 @@ write_read_check(avro_schema_t writers_schema, avro_datum_t datum,
 		if (size != avro_writer_tell(writer)) {
 			fprintf(stderr,
 				"Unable to calculate size %s validate=%d "
-				"(%"PRId64" != %"PRId64")\n  %s\n",
+				"(%" PRId64 " != %" PRId64 ")\n  %s\n",
 				type, validate, size, avro_writer_tell(writer),
 				avro_strerror());
 			exit(EXIT_FAILURE);
@@ -142,7 +142,7 @@ static void test_json(avro_datum_t datum, const char *expected)
 {
 	char  *json = NULL;
 	avro_datum_to_json(datum, 1, &json);
-	if (strcasecmp(json, expected) != 0) {
+	if (stricmp(json, expected) != 0) {
 		fprintf(stderr, "Unexpected JSON encoding: %s\n", json);
 		exit(EXIT_FAILURE);
 	}