diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12b65148..fe2ab6a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,7 +46,18 @@ if (FMT_SHARED)
   set(shared SHARED)
 endif ()
 
-add_library(format ${shared} format.cc format.h)
+include(CheckSymbolExists)
+if (WIN32)
+  check_symbol_exists(open io.h HAVE_OPEN)
+else ()
+  check_symbol_exists(open fcntl.h HAVE_OPEN)
+endif ()
+if (HAVE_OPEN)
+  add_definitions(-DFMT_USE_FILE_DESCRIPTORS=1)
+  set(FMT_POSIX_SRC posix.cc posix.h)
+endif ()
+
+add_library(format ${shared} format.cc format.h ${FMT_POSIX_SRC})
 if (CMAKE_COMPILER_IS_GNUCXX)
   set_target_properties(format PROPERTIES COMPILE_FLAGS
     "-Wall -Wextra -pedantic")
@@ -55,7 +66,7 @@ if (CPP11_FLAG AND FMT_EXTRA_TESTS)
   set_target_properties(format PROPERTIES COMPILE_FLAGS ${CPP11_FLAG})
   # Test compilation with default flags.
   file(GLOB src RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} test/*.cc test/*.h)
-  add_library(testformat format.cc ${src})
+  add_library(testformat format.cc ${FMT_POSIX_SRC} ${src})
 endif ()
 
 add_subdirectory(doc)
@@ -77,16 +88,6 @@ if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
   add_definitions(-DGTEST_USE_OWN_TR1_TUPLE=1)
 endif ()
 
-include(CheckSymbolExists)
-if (WIN32)
-  check_symbol_exists(open io.h HAVE_OPEN)
-else ()
-  check_symbol_exists(open fcntl.h HAVE_OPEN)
-endif ()
-if (HAVE_OPEN)
-  add_definitions(-DFMT_USE_FILE_DESCRIPTORS=1)
-endif ()
-
 enable_testing()
 
 include_directories(.)
diff --git a/posix.cc b/posix.cc
index 9d883603..9c3cc2ca 100644
--- a/posix.cc
+++ b/posix.cc
@@ -27,7 +27,6 @@
 
 #include "posix.h"
 
-#include <errno.h>
 #include <limits.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -44,16 +43,6 @@
 
 #endif  // _WIN32
 
-// Retries the expression while it evaluates to -1 and error equals to EINTR.
-#ifndef _WIN32
-# define FMT_RETRY(result, expression) \
-  do { \
-    result = (expression); \
-  } while (result == -1 && errno == EINTR)
-#else
-# define FMT_RETRY(result, expression) result = (expression)
-#endif
-
 namespace {
 #ifdef _WIN32
 // On Windows the count argument to read and write is unsigned, so convert
@@ -66,12 +55,12 @@ inline std::size_t ConvertRWCount(std::size_t count) { return count; }
 #endif
 }
 
-BufferedFile::~BufferedFile() FMT_NOEXCEPT(true) {
+fmt::BufferedFile::~BufferedFile() FMT_NOEXCEPT(true) {
   if (file_ && FMT_SYSTEM(fclose(file_)) != 0)
     fmt::ReportSystemError(errno, "cannot close file");
 }
 
-void BufferedFile::close() {
+void fmt::BufferedFile::close() {
   if (!file_)
     return;
   int result = FMT_SYSTEM(fclose(file_));
@@ -80,14 +69,14 @@ void BufferedFile::close() {
     fmt::ThrowSystemError(errno, "cannot close file");
 }
 
-int BufferedFile::fileno() const {
+int fmt::BufferedFile::fileno() const {
   int fd = FMT_POSIX_CALL(fileno(file_));
   if (fd == -1)
     fmt::ThrowSystemError(errno, "cannot get file descriptor");
   return fd;
 }
 
-File::File(const char *path, int oflag) {
+fmt::File::File(const char *path, int oflag) {
   int mode = S_IRUSR | S_IWUSR;
 #ifdef _WIN32
   fd_ = -1;
@@ -99,14 +88,14 @@ File::File(const char *path, int oflag) {
     fmt::ThrowSystemError(errno, "cannot open file {}") << path;
 }
 
-File::~File() FMT_NOEXCEPT(true) {
+fmt::File::~File() FMT_NOEXCEPT(true) {
   // Don't retry close in case of EINTR!
   // See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
   if (fd_ != -1 && FMT_POSIX_CALL(close(fd_)) != 0)
     fmt::ReportSystemError(errno, "cannot close file");
 }
 
-void File::close() {
+void fmt::File::close() {
   if (fd_ == -1)
     return;
   // Don't retry close in case of EINTR!
@@ -117,7 +106,7 @@ void File::close() {
     fmt::ThrowSystemError(errno, "cannot close file");
 }
 
-std::streamsize File::read(void *buffer, std::size_t count) {
+std::streamsize fmt::File::read(void *buffer, std::size_t count) {
   std::streamsize result = 0;
   FMT_RETRY(result, FMT_POSIX_CALL(read(fd_, buffer, ConvertRWCount(count))));
   if (result == -1)
@@ -125,7 +114,7 @@ std::streamsize File::read(void *buffer, std::size_t count) {
   return result;
 }
 
-std::streamsize File::write(const void *buffer, std::size_t count) {
+std::streamsize fmt::File::write(const void *buffer, std::size_t count) {
   std::streamsize result = 0;
   FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, ConvertRWCount(count))));
   if (result == -1)
@@ -133,7 +122,7 @@ std::streamsize File::write(const void *buffer, std::size_t count) {
   return result;
 }
 
-File File::dup(int fd) {
+fmt::File fmt::File::dup(int fd) {
   // Don't retry as dup doesn't return EINTR.
   // http://pubs.opengroup.org/onlinepubs/009695399/functions/dup.html
   int new_fd = FMT_POSIX_CALL(dup(fd));
@@ -142,7 +131,7 @@ File File::dup(int fd) {
   return File(new_fd);
 }
 
-void File::dup2(int fd) {
+void fmt::File::dup2(int fd) {
   int result = 0;
   FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
   if (result == -1) {
@@ -151,14 +140,14 @@ void File::dup2(int fd) {
   }
 }
 
-void File::dup2(int fd, ErrorCode &ec) FMT_NOEXCEPT(true) {
+void fmt::File::dup2(int fd, ErrorCode &ec) FMT_NOEXCEPT(true) {
   int result = 0;
   FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
   if (result == -1)
     ec = ErrorCode(errno);
 }
 
-void File::pipe(File &read_end, File &write_end) {
+void fmt::File::pipe(File &read_end, File &write_end) {
   // Close the descriptors first to make sure that assignments don't throw
   // and there are no leaks.
   read_end.close();
@@ -181,7 +170,7 @@ void File::pipe(File &read_end, File &write_end) {
   write_end = File(fds[1]);
 }
 
-BufferedFile File::fdopen(const char *mode) {
+fmt::BufferedFile fmt::File::fdopen(const char *mode) {
   // Don't retry as fdopen doesn't return EINTR.
   FILE *f = FMT_POSIX_CALL(fdopen(fd_, mode));
   if (!f) {
diff --git a/posix.h b/posix.h
index ef495bb0..bff3bb6f 100644
--- a/posix.h
+++ b/posix.h
@@ -28,12 +28,15 @@
 #ifndef FMT_POSIX_H
 #define FMT_POSIX_H
 
-#include <stdio.h>
+#include <errno.h>
 #include <fcntl.h>
+#include <stdio.h>
 
 #include <cstddef>
 #include <ios>
 
+#include "format.h"
+
 #ifndef FMT_POSIX
 # ifdef _WIN32
 // Fix warnings about deprecated symbols.
@@ -56,29 +59,41 @@
 # endif
 #endif
 
+// Retries the expression while it evaluates to -1 and error equals to EINTR.
+#ifndef _WIN32
+# define FMT_RETRY(result, expression) \
+  do { \
+    result = (expression); \
+  } while (result == -1 && errno == EINTR)
+#else
+# define FMT_RETRY(result, expression) result = (expression)
+#endif
+
+namespace fmt {
+
 // An error code.
 class ErrorCode {
- private:
+private:
   int value_;
 
- public:
-  explicit ErrorCode(int value = 0) FMT_NOEXCEPT(true) : value_(value) {}
+public:
+  explicit ErrorCode(int value = 0) FMT_NOEXCEPT(true) : value_(value) { }
 
   int get() const FMT_NOEXCEPT(true) { return value_; }
 };
 
 // A buffered file.
 class BufferedFile {
- private:
+private:
   FILE *file_;
 
   friend class File;
 
-  explicit BufferedFile(FILE *f) : file_(f) {}
+  explicit BufferedFile(FILE *f) : file_(f) { }
 
- public:
+public:
   // Constructs a BufferedFile object which doesn't represent any file.
-  BufferedFile() FMT_NOEXCEPT(true) : file_(0) {}
+  BufferedFile() FMT_NOEXCEPT(true) : file_(0) { }
 
   // Destroys the object closing the file it represents if any.
   ~BufferedFile() FMT_NOEXCEPT(true);
@@ -87,16 +102,16 @@ class BufferedFile {
   // Emulate a move constructor and a move assignment operator if rvalue
   // references are not supported.
 
- private:
+private:
   // A proxy object to emulate a move constructor.
   // It is private to make it impossible call operator Proxy directly.
   struct Proxy {
     FILE *file;
   };
 
- public:
+public:
   // A "move constructor" for moving from a temporary.
-  BufferedFile(Proxy p) FMT_NOEXCEPT(true) : file_(p.file) {}
+  BufferedFile(Proxy p) FMT_NOEXCEPT(true) : file_(p.file) { }
 
   // A "move constructor" for for moving from an lvalue.
   BufferedFile(BufferedFile &f) FMT_NOEXCEPT(true) : file_(f.file_) {
@@ -125,6 +140,7 @@ class BufferedFile {
     file_ = 0;
     return p;
   }
+
 #else
  private:
   GTEST_DISALLOW_COPY_AND_ASSIGN_(BufferedFile);
@@ -158,22 +174,22 @@ class BufferedFile {
 // than an exception. You can get standard behavior by overriding the
 // invalid parameter handler with _set_invalid_parameter_handler.
 class File {
- private:
+private:
   int fd_;  // File descriptor.
 
   // Constructs a File object with a given descriptor.
-  explicit File(int fd) : fd_(fd) {}
+  explicit File(int fd) : fd_(fd) { }
 
- public:
+public:
   // Possible values for the oflag argument to the constructor.
   enum {
     RDONLY = FMT_POSIX(O_RDONLY), // Open for reading only.
     WRONLY = FMT_POSIX(O_WRONLY), // Open for writing only.
-    RDWR   = FMT_POSIX(O_RDWR)    // Open for reading and writing.
+    RDWR = FMT_POSIX(O_RDWR)    // Open for reading and writing.
   };
 
   // Constructs a File object which doesn't represent any file.
-  File() FMT_NOEXCEPT(true) : fd_(-1) {}
+  File() FMT_NOEXCEPT(true) : fd_(-1) { }
 
   // Opens a file and constructs a File object representing this file.
   File(const char *path, int oflag);
@@ -182,16 +198,16 @@ class File {
   // Emulate a move constructor and a move assignment operator if rvalue
   // references are not supported.
 
- private:
+private:
   // A proxy object to emulate a move constructor.
   // It is private to make it impossible call operator Proxy directly.
   struct Proxy {
     int fd;
   };
 
- public:
+public:
   // A "move constructor" for moving from a temporary.
-  File(Proxy p) FMT_NOEXCEPT(true) : fd_(p.fd) {}
+  File(Proxy p) FMT_NOEXCEPT(true) : fd_(p.fd) { }
 
   // A "move constructor" for for moving from an lvalue.
   File(File &other) FMT_NOEXCEPT(true) : fd_(other.fd_) {
@@ -220,6 +236,7 @@ class File {
     fd_ = -1;
     return p;
   }
+
 #else
  private:
   GTEST_DISALLOW_COPY_AND_ASSIGN_(File);
@@ -273,11 +290,13 @@ class File {
   BufferedFile fdopen(const char *mode);
 };
 
+}
+
 #if !FMT_USE_RVALUE_REFERENCES
 namespace std {
 // For compatibility with C++98.
-inline BufferedFile &move(BufferedFile &f) { return f; }
-inline File &move(File &f) { return f; }
+inline fmt::BufferedFile &move(fmt::BufferedFile &f) { return f; }
+inline fmt::File &move(fmt::File &f) { return f; }
 }
 #endif
 
diff --git a/test/format-test.cc b/test/format-test.cc
index cf0dbb2b..065f0cf8 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -1466,6 +1466,9 @@ TEST(FormatterTest, OutputNotWrittenOnError) {
 
 #if FMT_USE_FILE_DESCRIPTORS
 
+using fmt::BufferedFile;
+using fmt::File;
+
 TEST(FormatterTest, FileSink) {
   File read_end, write_end;
   File::pipe(read_end, write_end);
diff --git a/test/gtest-extra-test.cc b/test/gtest-extra-test.cc
index b2d9ce82..5d5c678b 100644
--- a/test/gtest-extra-test.cc
+++ b/test/gtest-extra-test.cc
@@ -356,6 +356,10 @@ TEST(UtilTest, FormatSystemErrorMessage) {
 
 #if FMT_USE_FILE_DESCRIPTORS
 
+using fmt::BufferedFile;
+using fmt::ErrorCode;
+using fmt::File;
+
 // Checks if the file is open by reading one character from it.
 bool IsOpen(int fd) {
   char buffer;
diff --git a/test/gtest-extra.cc b/test/gtest-extra.cc
index 41a80a28..e11b49db 100644
--- a/test/gtest-extra.cc
+++ b/test/gtest-extra.cc
@@ -29,7 +29,7 @@
 
 #if FMT_USE_FILE_DESCRIPTORS
 
-#include "posix.cc"
+using fmt::File;
 
 void OutputRedirect::Flush() {
 #if EOF != -1
diff --git a/test/gtest-extra.h b/test/gtest-extra.h
index 3211c062..c19ed889 100644
--- a/test/gtest-extra.h
+++ b/test/gtest-extra.h
@@ -99,8 +99,8 @@ std::string FormatSystemErrorMessage(int error_code, fmt::StringRef message);
 class OutputRedirect {
  private:
   FILE *file_;
-  File original_;  // Original file passed to redirector.
-  File read_end_;  // Read end of the pipe where the output is redirected.
+  fmt::File original_;  // Original file passed to redirector.
+  fmt::File read_end_;  // Read end of the pipe where the output is redirected.
 
   GTEST_DISALLOW_COPY_AND_ASSIGN_(OutputRedirect);
 
diff --git a/test/posix-test.cc b/test/posix-test.cc
index 5c9ab023..5dcebcd3 100644
--- a/test/posix-test.cc
+++ b/test/posix-test.cc
@@ -37,6 +37,10 @@
 
 #include "gtest-extra.h"
 
+using fmt::BufferedFile;
+using fmt::ErrorCode;
+using fmt::File;
+
 namespace {
 int open_count;
 int close_count;