cpp unit tests fail to build

[jbeich]

$ pkg info -x icu 'g.*test'
icu-58.2,1
googletest-1.8.0.11

$ c++ -v
FreeBSD clang version 4.0.0 (trunk 291476) (based on LLVM 4.0.0svn)
Target: x86_64-unknown-freebsd12.0
Thread model: posix
InstalledDir: /usr/bin
Found CUDA installation: /usr/local/cuda, version 7.5

$ cmake /path/to/sfntly/cpp
$ gmake
[...]
cpp/src/test/smart_pointer_test.cc:35:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), p1->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:36:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:40:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(2), p1->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:41:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(2), p2->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:42:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:46:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(3), p1->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:47:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(3), p2->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:48:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(3), p3->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:49:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:52:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(2), p1->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:53:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), p2->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:54:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(2), p3->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:55:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(2), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:58:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), p1->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:60:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(2), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:63:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:66:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), p1->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:67:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:70:30: error: 'ref_count_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), p1->ref_count_);
                             ^
cpp/src/sfntly/port/refcount.h:159:18: note: declared private here
  mutable size_t ref_count_;  // reference count of current object
                 ^
cpp/src/test/smart_pointer_test.cc:71:43: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
    EXPECT_EQ(size_t(1), RefCounted<Foo>::object_counter_);
                                          ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
cpp/src/test/smart_pointer_test.cc:73:41: error: 'object_counter_' is a private member of
      'sfntly::RefCounted<Foo>'
  EXPECT_EQ(size_t(0), RefCounted<Foo>::object_counter_);
                                        ^
cpp/src/sfntly/port/refcount.h:161:17: note: declared private here
  static size_t object_counter_;
                ^
21 errors generated.