diff --git a/build_tools/build_detect_platform b/build_tools/build_detect_platform
index 3389d2851..8479e3127 100755
--- a/build_tools/build_detect_platform
+++ b/build_tools/build_detect_platform
@@ -46,7 +46,7 @@ PLATFORM_CXXFLAGS="-std=c++11"
 COMMON_FLAGS="-DROCKSDB_PLATFORM_POSIX"
 
 # Default to fbcode gcc on internal fb machines
-if [ -d /mnt/gvfs/third-party -a -z "$CXX" ]; then
+if [ -z "$ROCKSDB_NO_FBCODE" -a -d /mnt/gvfs/third-party ]; then
     FBCODE_BUILD="true"
     if [ -z "$USE_CLANG" ]; then
         CENTOS_VERSION=`rpm -q --qf "%{VERSION}" \
diff --git a/db/db_impl.cc b/db/db_impl.cc
index 26df8fb2a..6038c2ce5 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -2356,10 +2356,11 @@ Status DBImpl::BackgroundCompaction(bool* madeProgress,
 
     Version::LevelSummaryStorage tmp;
     LogToBuffer(
-        log_buffer, "[%s] Moved #%lld to level-%d %lld bytes %s: %s\n",
+        log_buffer,
+        "[%s] Moved #%" PRIu64 " to level-%d %" PRIu64 " bytes %s: %s\n",
         c->column_family_data()->GetName().c_str(),
-        static_cast<unsigned long long>(f->fd.GetNumber()), c->level() + 1,
-        static_cast<unsigned long long>(f->fd.GetFileSize()),
+        f->fd.GetNumber(), c->level() + 1,
+        f->fd.GetFileSize(),
         status.ToString().c_str(), c->input_version()->LevelSummary(&tmp));
     c->ReleaseCompactionFiles(status);
     *madeProgress = true;
diff --git a/util/env_test.cc b/util/env_test.cc
index 1c4d0bba0..3e811a98d 100644
--- a/util/env_test.cc
+++ b/util/env_test.cc
@@ -17,6 +17,11 @@
 #include <unistd.h>
 #endif
 
+#ifdef ROCKSDB_FALLOCATE_PRESENT
+#include <errno.h>
+#include <fcntl.h>
+#endif
+
 #include "rocksdb/env.h"
 #include "port/port.h"
 #include "util/coding.h"
@@ -478,6 +483,31 @@ TEST(EnvPosixTest, RandomAccessUniqueID) {
 #ifdef ROCKSDB_FALLOCATE_PRESENT
 TEST(EnvPosixTest, AllocateTest) {
   std::string fname = GetOnDiskTestDir() + "/preallocate_testfile";
+
+  // Try fallocate in a file to see whether the target file system supports it.
+  // Skip the test if fallocate is not supported.
+  std::string fname_test_fallocate =
+      GetOnDiskTestDir() + "/preallocate_testfile_2";
+  int fd = -1;
+  do {
+    fd = open(fname_test_fallocate.c_str(), O_CREAT | O_RDWR | O_TRUNC, 0644);
+  } while (fd < 0 && errno == EINTR);
+  ASSERT_GT(fd, 0);
+
+  int alloc_status = fallocate(fd, 0, 0, 1);
+
+  int err_number = 0;
+  if (alloc_status != 0) {
+    err_number = errno;
+    fprintf(stderr, "Warning: fallocate() fails, %s\n", strerror(err_number));
+  }
+  close(fd);
+  ASSERT_OK(env_->DeleteFile(fname_test_fallocate));
+  if (alloc_status != 0 && err_number == EOPNOTSUPP) {
+    // The filesystem containing the file does not support fallocate
+    return;
+  }
+
   EnvOptions soptions;
   soptions.use_mmap_writes = false;
   unique_ptr<WritableFile> wfile;
diff --git a/util/options.cc b/util/options.cc
index a61d9d633..f0042cbda 100644
--- a/util/options.cc
+++ b/util/options.cc
@@ -419,7 +419,7 @@ void ColumnFamilyOptions::Dump(Logger* log) const {
             "max_size_amplification_percent: %u",
         compaction_options_universal.max_size_amplification_percent);
     Log(log,
-        "Options.compaction_options_universal.compression_size_percent: %u",
+        "Options.compaction_options_universal.compression_size_percent: %d",
         compaction_options_universal.compression_size_percent);
     Log(log, "Options.compaction_options_fifo.max_table_files_size: %" PRIu64,
         compaction_options_fifo.max_table_files_size);