diff --git a/CMakeLists.txt b/CMakeLists.txt
index e7da994625eb0a38d13ccb71580bcfbccd8440c2..8577506cb82dab6c41040e3419ea4280f57e3180 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -179,13 +179,6 @@ IF(KWSYS_USE_ConsoleBuf)
   SET(KWSYS_USE_Encoding 1)
 ENDIF()
 
-# Setup the large file support default.
-IF(KWSYS_LFS_DISABLE)
-  SET(KWSYS_LFS_REQUESTED 0)
-ELSE()
-  SET(KWSYS_LFS_REQUESTED 1)
-ENDIF()
-
 # Specify default 8 bit encoding for Windows
 IF(NOT KWSYS_ENCODING_DEFAULT_CODEPAGE)
   SET(KWSYS_ENCODING_DEFAULT_CODEPAGE CP_ACP)
@@ -352,30 +345,6 @@ IF(KWSYS_STANDALONE)
   ENDIF()
 ENDIF()
 
-#-----------------------------------------------------------------------------
-# Configure Large File Support.
-KWSYS_PLATFORM_CXX_TEST(KWSYS_CXX_HAS_CSTDIO
-  "Checking whether header cstdio is available" DIRECT)
-SET(KWSYS_LFS_AVAILABLE 0)
-IF(KWSYS_LFS_REQUESTED)
-  # Large File Support is requested.
-  SET(KWSYS_LFS_REQUESTED 1)
-
-  # Check for large file support.
-  SET(KWSYS_PLATFORM_CXX_TEST_DEFINES
-    -DKWSYS_CXX_HAS_CSTDIO=${KWSYS_CXX_HAS_CSTDIO})
-  KWSYS_PLATFORM_CXX_TEST_RUN(KWSYS_LFS_WORKS
-    "Checking for Large File Support" DIRECT)
-  SET(KWSYS_PLATFORM_CXX_TEST_DEFINES)
-
-  IF(KWSYS_LFS_WORKS)
-    SET(KWSYS_LFS_AVAILABLE 1)
-  ENDIF()
-ELSE()
-  # Large File Support is not requested.
-  SET(KWSYS_LFS_REQUESTED 0)
-ENDIF()
-
 #-----------------------------------------------------------------------------
 # Configure the standard library header wrappers based on compiler's
 # capabilities and parent project's request.  Enforce 0/1 as only
@@ -575,9 +544,6 @@ IF(KWSYS_USE_SystemInformation)
         COMPILE_DEFINITIONS KWSYS_SYS_HAS_MACHINE_CPU_H=1)
     ENDIF()
   ENDIF()
-  IF(KWSYS_LFS_AVAILABLE AND NOT KWSYS_LFS_DISABLE)
-    SET(KWSYS_PLATFORM_CXX_TEST_DEFINES -DKWSYS_HAS_LFS=1)
-  ENDIF()
   KWSYS_PLATFORM_CXX_TEST(KWSYS_CXX_HAS_RLIMIT64
     "Checking whether CXX compiler has rlimit64" DIRECT)
   SET(KWSYS_PLATFORM_CXX_TEST_DEFINES)
diff --git a/Configure.h.in b/Configure.h.in
index bec1abca43bc809e118b4b4981e9c30ae23bba9a..5323c57bebe1b1f18b2301342016f21afc91f6d6 100644
--- a/Configure.h.in
+++ b/Configure.h.in
@@ -28,43 +28,6 @@
 /* Whether kwsys namespace is "kwsys".  */
 #define @KWSYS_NAMESPACE@_NAME_IS_KWSYS @KWSYS_NAME_IS_KWSYS@
 
-/* Whether Large File Support is requested.  */
-#define @KWSYS_NAMESPACE@_LFS_REQUESTED @KWSYS_LFS_REQUESTED@
-
-/* Whether Large File Support is available.  */
-#if @KWSYS_NAMESPACE@_LFS_REQUESTED
-#  define @KWSYS_NAMESPACE@_LFS_AVAILABLE @KWSYS_LFS_AVAILABLE@
-#endif
-
-/* Setup Large File Support if requested.  */
-#if @KWSYS_NAMESPACE@_LFS_REQUESTED
-/* Since LFS is requested this header must be included before system
-   headers whether or not LFS is available. */
-#  if 0 && (defined(_SYS_TYPES_H) || defined(_SYS_TYPES_INCLUDED))
-#    error "@KWSYS_NAMESPACE@/Configure.h must be included before sys/types.h"
-#  endif
-/* Enable the large file API if it is available.  */
-#  if @KWSYS_NAMESPACE@_LFS_AVAILABLE &&                                      \
-    !defined(@KWSYS_NAMESPACE@_LFS_NO_DEFINES)
-#    if !defined(_LARGEFILE_SOURCE) &&                                        \
-      !defined(@KWSYS_NAMESPACE@_LFS_NO_DEFINE_LARGEFILE_SOURCE)
-#      define _LARGEFILE_SOURCE
-#    endif
-#    if !defined(_LARGEFILE64_SOURCE) &&                                      \
-      !defined(@KWSYS_NAMESPACE@_LFS_NO_DEFINE_LARGEFILE64_SOURCE)
-#      define _LARGEFILE64_SOURCE
-#    endif
-#    if !defined(_LARGE_FILES) &&                                             \
-      !defined(@KWSYS_NAMESPACE@_LFS_NO_DEFINE_LARGE_FILES)
-#      define _LARGE_FILES
-#    endif
-#    if !defined(_FILE_OFFSET_BITS) &&                                        \
-      !defined(@KWSYS_NAMESPACE@_LFS_NO_DEFINE_FILE_OFFSET_BITS)
-#      define _FILE_OFFSET_BITS 64
-#    endif
-#  endif
-#endif
-
 /* Setup the export macro.  */
 #if @KWSYS_BUILD_SHARED@
 #  if defined(_WIN32) || defined(__CYGWIN__)
diff --git a/kwsysPlatformTestsCXX.cxx b/kwsysPlatformTestsCXX.cxx
index b77d7292a6f7096005184e05c126bc68bfcec2f8..cfd5666f3040dfa4bd2079ce64ffac6f11df394b 100644
--- a/kwsysPlatformTestsCXX.cxx
+++ b/kwsysPlatformTestsCXX.cxx
@@ -136,42 +136,6 @@ int main()
 }
 #endif
 
-#ifdef TEST_KWSYS_LFS_WORKS
-/* Return 0 when LFS is available and 1 otherwise.  */
-#  define _LARGEFILE_SOURCE
-#  define _LARGEFILE64_SOURCE
-#  define _LARGE_FILES
-#  define _FILE_OFFSET_BITS 64
-#  include <sys/types.h>
-
-#  include <assert.h>
-#  include <sys/stat.h>
-#  if KWSYS_CXX_HAS_CSTDIO
-#    include <cstdio>
-#  endif
-#  include <stdio.h>
-
-int main(int, char** argv)
-{
-/* check that off_t can hold 2^63 - 1 and perform basic operations... */
-#  define OFF_T_64 (((off_t)1 << 62) - 1 + ((off_t)1 << 62))
-  if (OFF_T_64 % 2147483647 != 1)
-    return 1;
-
-  // stat breaks on SCO OpenServer
-  struct stat buf;
-  stat(argv[0], &buf);
-  if (!S_ISREG(buf.st_mode))
-    return 2;
-
-  FILE* file = fopen(argv[0], "r");
-  off_t offset = ftello(file);
-  fseek(file, offset, SEEK_CUR);
-  fclose(file);
-  return 0;
-}
-#endif
-
 #ifdef TEST_KWSYS_CXX_HAS_SETENV
 #  include <stdlib.h>
 int main()
@@ -212,12 +176,6 @@ int main()
 #endif
 
 #ifdef TEST_KWSYS_CXX_HAS_RLIMIT64
-#  if defined(KWSYS_HAS_LFS)
-#    define _LARGEFILE_SOURCE
-#    define _LARGEFILE64_SOURCE
-#    define _LARGE_FILES
-#    define _FILE_OFFSET_BITS 64
-#  endif
 #  include <sys/resource.h>
 int main()
 {