diff --git a/metagraph/CMakeLists.txt b/metagraph/CMakeLists.txt
index 95fa5b0464..b92c3685eb 100644
--- a/metagraph/CMakeLists.txt
+++ b/metagraph/CMakeLists.txt
@@ -334,6 +334,8 @@ target_compile_options(zlib
     -Wno-implicit-fallthrough
     -Wno-deprecated-non-prototype
     -Wno-unknown-warning-option
+    -Wno-unused-parameter
+    -Wno-maybe-uninitialized
 )
 
 add_library(progress_bar STATIC
diff --git a/metagraph/CMakeListsKMC.txt.in b/metagraph/CMakeListsKMC.txt.in
index 89b8aaa60a..880710cea4 100644
--- a/metagraph/CMakeListsKMC.txt.in
+++ b/metagraph/CMakeListsKMC.txt.in
@@ -2,7 +2,11 @@ cmake_minimum_required(VERSION 2.8.12)
 
 project(KMC)
 
-add_compile_options(-Wall -O3 -m64 -pthread -std=c++11)
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm|aarch64|arm64)")
+  add_compile_options(-Wall -O3 -pthread -std=c++11)
+else()
+  add_compile_options(-Wall -O3 -m64 -pthread -std=c++11)
+endif()
 
 if(@BUILD_STATIC@)
 string(APPEND CMAKE_CXX_FLAGS " -static ")
diff --git a/metagraph/external-libraries/KMC b/metagraph/external-libraries/KMC
index 0aa85a021e..b163688487 160000
--- a/metagraph/external-libraries/KMC
+++ b/metagraph/external-libraries/KMC
@@ -1 +1 @@
-Subproject commit 0aa85a021efeace2f9b0776ebc1b8109ccc9b572
+Subproject commit b163688487c85bdcfeaec70d6f5892868a832040
diff --git a/metagraph/external-libraries/sdsl-lite b/metagraph/external-libraries/sdsl-lite
index fe4a62b38f..08022857f9 160000
--- a/metagraph/external-libraries/sdsl-lite
+++ b/metagraph/external-libraries/sdsl-lite
@@ -1 +1 @@
-Subproject commit fe4a62b38f5a835b8257b60f0701c74ebbc50a18
+Subproject commit 08022857f9835a0361a0a193e7f384adff58058f
diff --git a/metagraph/external-libraries/zlib b/metagraph/external-libraries/zlib
index d20bdfcd0e..1252e25655 160000
--- a/metagraph/external-libraries/zlib
+++ b/metagraph/external-libraries/zlib
@@ -1 +1 @@
-Subproject commit d20bdfcd0efbdd72cb9d857e098ceac1bad41432
+Subproject commit 1252e2565573fe150897c9d8b44d3453396575ff
diff --git a/metagraph/src/common/bloom_filter.cpp b/metagraph/src/common/bloom_filter.cpp
index f10fe30a1b..5b090a5c63 100644
--- a/metagraph/src/common/bloom_filter.cpp
+++ b/metagraph/src/common/bloom_filter.cpp
@@ -110,7 +110,8 @@ batch_insert_avx2(BloomFilter &bloom,
     for (; hashes_begin + 4 <= hashes_end; hashes_begin += 4) {
         simde__m256i block_indices
             = restrict_to_mask_epi64(hashes_begin, size, block_mask_out);
-        const uint64_t *block_index_array = reinterpret_cast<const uint64_t*>(&block_indices);
+        alignas(32) uint64_t block_index_array[4];
+        simde_mm256_store_si256(reinterpret_cast<simde__m256i*>(block_index_array), block_indices);
 
         if (num_hash_functions_ > 1) {
             for (size_t j = 0; j < 4; ++j) {
@@ -211,13 +212,13 @@ batch_check_avx2(const BloomFilter &bloom,
     const simde__m256i add = simde_mm256_setr_epi64x(0, 1, 2, 3);
     const simde__m256i numhash = simde_mm256_set1_epi64x(num_hash_functions_);
 
-    simde__m256i block_indices;
-    const uint64_t *block_index_array = reinterpret_cast<const uint64_t*>(&block_indices);
-
     // check four input elements (represented by hashes) at a time
     size_t i = 0;
     for (; hashes_begin + 4 <= hashes_end; hashes_begin += 4) {
-        block_indices = restrict_to_mask_epi64(hashes_begin, size, block_mask_out);
+        simde__m256i block_indices = restrict_to_mask_epi64(hashes_begin, size, block_mask_out);
+        alignas(32) uint64_t block_index_array[4];
+        simde_mm256_store_si256(reinterpret_cast<simde__m256i*>(block_index_array), block_indices);
+
 
         if (num_hash_functions_ > 1) {
             for (size_t j = 0; j < 4; ++j) {
diff --git a/metagraph/src/common/serialization.cpp b/metagraph/src/common/serialization.cpp
index 80e0ee4252..ef97b3bee9 100644
--- a/metagraph/src/common/serialization.cpp
+++ b/metagraph/src/common/serialization.cpp
@@ -22,6 +22,7 @@
 
 #endif
 
+#include <boost/locale.hpp>
 #include <tsl/hopscotch_map.h>
 #include <sdsl/int_vector.hpp>
 
@@ -171,9 +172,7 @@ template bool load_number_vector<bool>(std::istream &in, std::vector<bool> *);
 void encode_utf8(uint32_t num, std::ostream &out) {
     if (num > 0x7FFFFFFF)
         throw std::runtime_error("Encoding value out of range for code.");
-
-    std::string enc = std::wstring_convert<std::codecvt_utf8<char32_t>,
-                                           char32_t>().to_bytes(num);
+    std::string enc = boost::locale::conv::utf_to_utf<char>(std::u32string(1, num));
     out.write(enc.c_str(), enc.size());
 }
 
diff --git a/metagraph/src/seq_io/sequence_io.cpp b/metagraph/src/seq_io/sequence_io.cpp
index c7d9aa76a5..9af282291c 100644
--- a/metagraph/src/seq_io/sequence_io.cpp
+++ b/metagraph/src/seq_io/sequence_io.cpp
@@ -5,6 +5,8 @@
 #include <fstream>
 #include <thread>
 
+#include <unistd.h>
+
 #include "common/seq_tools/reverse_complement.hpp"
 #include "common/utils/string_utils.hpp"
 #include "vcf_parser.hpp"
diff --git a/metagraph/tests/test_utils.cpp b/metagraph/tests/test_utils.cpp
index 030808c261..8ef7887896 100644
--- a/metagraph/tests/test_utils.cpp
+++ b/metagraph/tests/test_utils.cpp
@@ -102,7 +102,7 @@ TEST(Utils, TempFileCheckStateFlow) {
     {
         utils::TempFile tmp;
         ASSERT_TRUE(tmp.ifstream().good());
-        EXPECT_DEBUG_DEATH(tmp.ofstream().good(), "Can't write after reading");
+        EXPECT_DEBUG_DEATH((void)tmp.ofstream().good(), "Can't write after reading");
     }
     {
         utils::TempFile tmp;
@@ -110,7 +110,7 @@ TEST(Utils, TempFileCheckStateFlow) {
         ASSERT_TRUE(tmp.ofstream().good());
         ASSERT_TRUE(tmp.ifstream().good());
         ASSERT_TRUE(tmp.ifstream().good());
-        EXPECT_DEBUG_DEATH(tmp.ofstream().good(), "Can't write after reading");
+        EXPECT_DEBUG_DEATH((void)tmp.ofstream().good(), "Can't write after reading");
     }
 }