+++ src/io/MemMgrAllocator.cc
@@ -185,5 +185,5 @@
     }
     if (!data) {
-        fprintf(stderr, "Insufficient memory: unable to mmap or calloc %ld bytes\n", total_size);
+        fprintf(stderr, "Insufficient memory: unable to mmap or calloc %zu bytes\n", total_size);
         fflush(stderr);
         exit(37);
+++ test_suite/timing_driver.cc
@@ -79,5 +81,5 @@
         }
     } else {
-        fprintf(stderr, "Files differ in size %ld != %ld\n", data_size, roundtrip_size);
+        fprintf(stderr, "Files differ in size %zu != %zu\n", data_size, roundtrip_size);
     }
     int status;
@@ -396,5 +398,5 @@
                                                     leptonBuffer.size());
         if (result != testImage.size()) {
-            fprintf(stderr, "Output Size %ld != %ld\n", result, testImage.size());
+            fprintf(stderr, "Output Size %zu != %zu\n", result, testImage.size());
         }
         always_assert(result == (size_t)testImage.size() &&
@@ -508,5 +510,5 @@
     for (std::vector<const char *>::const_iterator filename = filenames.begin(); filename != filenames.end(); ++filename) {
         testImage = load(*filename);
-        fprintf(stderr, "Loading iPhone %ld\n", testImage.size());
+        fprintf(stderr, "Loading iPhone %u\n", testImage.size());
         int retval = run_test(testImage,
                               use_lepton, jailed, inject_syscall_level, allow_progressive_files, multithread,
+++ src/lepton/validation.cc
@@ -159,5 +159,5 @@
     }
     if (roundtrip_size != size || memcmp(&md5[0], &rtmd5[0], md5.size()) != 0) {
-        fprintf(stderr, "Input Size %ld != Roundtrip Size %ld\n", size, roundtrip_size);
+        fprintf(stderr, "Input Size %zu != Roundtrip Size %zu\n", size, roundtrip_size);
         for (size_t i = 0; i < md5.size(); ++i) {
             fprintf(stderr, "%02x", md5[i]);            
+++ src/io/ioutil.cc
@@ -339,3 +339,3 @@
     static_assert(sizeof(buffer) >= header.size(), "Buffer must be able to hold header");
-    uint32_t cursor = 0;
+    ssize_t cursor = 0;
     bool finished = false;
+++ src/lepton/jpgcoder.cc
@@ -1101,5 +1098,5 @@
     if (false) {
         fprintf(stderr,
-                "Predicted Decompress %ld\nAllocated This Run %ld vs Max allocated %ld\nMax Peak Size %ld vs %ld\naug-gbg %ld, garbage %ld\nbit_writer %ld\nmux %d\n",
+                "Predicted Decompress %zu\nAllocated This Run %zu vs Max allocated %zu\nMax Peak Size %zu vs %zu\naug-gbg %zu, garbage %zu\nbit_writer %zu\nmux %d\n",
                 decom_memory_bound,
                 Sirikata::memmgr_size_allocated(),