diff --git a/CMake/GenerateDCMTKConfigure.cmake b/CMake/GenerateDCMTKConfigure.cmake
index ac3ae70aa..87b62f7af 100644
--- a/CMake/GenerateDCMTKConfigure.cmake
+++ b/CMake/GenerateDCMTKConfigure.cmake
@@ -241,9 +241,14 @@ include("${CMAKE_ROOT}/Modules/CheckFunctionExists.cmake")
 include("${CMAKE_ROOT}/Modules/CheckLibraryExists.cmake")
 include("${DCMTK_CMAKE_INCLUDE}CMake/CheckFunctionWithHeaderExists.cmake")
 include(CheckCXXSymbolExists OPTIONAL)
-if(NOT COMMAND CHECK_CXX_SYMBOL_EXISTS)
-  # fallback implementation for old CMake Versions
-  function(CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VAR)
+# Defined with DCMTK_ prefix to avoid overriding the global command name.
+if(COMMAND check_cxx_symbol_exists)
+  macro(DCMTK_CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VAR)
+    check_cxx_symbol_exists("${SYMBOL}" "${FILES}" "${VAR}")
+  endmacro()
+else()
+  # Fallback for CMake versions that predate CheckCXXSymbolExists
+  function(DCMTK_CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VAR)
     set(CODE)
     foreach(FILE ${FILES})
       set(CODE "${CODE}#include <${FILE}>\n")
@@ -256,7 +261,7 @@ endif()
 foreach(FUNC "__FUNCTION__" "__PRETTY_FUNCTION__" "__func__")
   CHECK_SYMBOL_EXISTS("${FUNC}" "" "HAVE_${FUNC}_C_MACRO")
   # test if the C++ compiler also supports them (e.g. SunPro doesn't)
-  CHECK_CXX_SYMBOL_EXISTS("${FUNC}" "" "HAVE_${FUNC}_CXX_MACRO")
+  DCMTK_CHECK_CXX_SYMBOL_EXISTS("${FUNC}" "" "HAVE_${FUNC}_CXX_MACRO")
   if(HAVE_${FUNC}_C_MACRO AND HAVE_${FUNC}_CXX_MACRO)
     set("HAVE_${FUNC}_MACRO" 1 CACHE INTERNAL "Have symbol ${FUNC}" FORCE)
   else()
@@ -505,48 +510,53 @@ endif()
     set(CXXHEADERS ${CXXHEADERS} cstdint)
   endif()
 
+  # On Windows check_function_exists fails due to symbol name mangling; use
+  # check_symbol_exists instead. Defined with DCMTK_ prefix to avoid
+  # overriding the global CHECK_FUNCTION_EXISTS command.
   if(WIN32)
-    # CHECK_FUNCTION_EXISTS does not work correctly on Windows (due to symbol name mangling)
-    # use CHECK_SYMBOL_EXISTS instead
-    macro(CHECK_FUNCTION_EXISTS FUNCTION VAR)
+    macro(DCMTK_CHECK_FUNCTION_EXISTS FUNCTION VAR)
       check_symbol_exists("${FUNCTION}" "${HEADERS}" "${VAR}")
     endmacro()
+  else()
+    macro(DCMTK_CHECK_FUNCTION_EXISTS FUNCTION VAR)
+      check_function_exists("${FUNCTION}" "${VAR}")
+    endmacro()
   endif()
 
-  CHECK_FUNCTION_EXISTS(_findfirst HAVE__FINDFIRST)
-  CHECK_FUNCTION_EXISTS(_set_output_format HAVE__SET_OUTPUT_FORMAT)
-  CHECK_FUNCTION_EXISTS(atoll HAVE_ATOLL)
-  CHECK_FUNCTION_EXISTS(cuserid HAVE_CUSERID)
-  CHECK_FUNCTION_EXISTS(fgetln HAVE_FGETLN)
-  CHECK_FUNCTION_EXISTS(flock HAVE_FLOCK)
-  CHECK_FUNCTION_EXISTS(fork HAVE_FORK)
-  CHECK_FUNCTION_EXISTS(fseeko HAVE_FSEEKO)
-  CHECK_FUNCTION_EXISTS(ftime HAVE_FTIME)
-  CHECK_FUNCTION_EXISTS(geteuid HAVE_GETEUID)
-  CHECK_FUNCTION_EXISTS(getgrnam HAVE_GETGRNAM)
-  CHECK_FUNCTION_EXISTS(gethostbyaddr_r HAVE_GETHOSTBYADDR_R)
-  CHECK_FUNCTION_EXISTS(gethostbyname_r HAVE_GETHOSTBYNAME_R)
-  CHECK_FUNCTION_EXISTS(gethostid HAVE_GETHOSTID)
-  CHECK_FUNCTION_EXISTS(getlogin HAVE_GETLOGIN)
-  CHECK_FUNCTION_EXISTS(getlogin_r HAVE_GETLOGIN_R)
-  CHECK_FUNCTION_EXISTS(getpwnam HAVE_GETPWNAM)
-  CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)
-  CHECK_FUNCTION_EXISTS(getuid HAVE_GETUID)
-  CHECK_FUNCTION_EXISTS(gmtime_r HAVE_GMTIME_R)
-  CHECK_FUNCTION_EXISTS(localtime_r HAVE_LOCALTIME_R)
-  CHECK_FUNCTION_EXISTS(lockf HAVE_LOCKF)
-  CHECK_FUNCTION_EXISTS(lstat HAVE_LSTAT)
-  CHECK_FUNCTION_EXISTS(malloc_debug HAVE_MALLOC_DEBUG)
-  CHECK_FUNCTION_EXISTS(mkstemp HAVE_MKSTEMP)
-  CHECK_FUNCTION_EXISTS(nanosleep HAVE_NANOSLEEP)
-  CHECK_FUNCTION_EXISTS(setuid HAVE_SETUID)
-  CHECK_FUNCTION_EXISTS(sleep HAVE_SLEEP)
-  CHECK_FUNCTION_EXISTS(strlcat HAVE_STRLCAT)
-  CHECK_FUNCTION_EXISTS(strlcpy HAVE_STRLCPY)
-  CHECK_FUNCTION_EXISTS(sysinfo HAVE_SYSINFO)
-  CHECK_FUNCTION_EXISTS(uname HAVE_UNAME)
-  CHECK_FUNCTION_EXISTS(usleep HAVE_USLEEP)
-  CHECK_FUNCTION_EXISTS(waitpid HAVE_WAITPID)
+  DCMTK_CHECK_FUNCTION_EXISTS(_findfirst HAVE__FINDFIRST)
+  DCMTK_CHECK_FUNCTION_EXISTS(_set_output_format HAVE__SET_OUTPUT_FORMAT)
+  DCMTK_CHECK_FUNCTION_EXISTS(atoll HAVE_ATOLL)
+  DCMTK_CHECK_FUNCTION_EXISTS(cuserid HAVE_CUSERID)
+  DCMTK_CHECK_FUNCTION_EXISTS(fgetln HAVE_FGETLN)
+  DCMTK_CHECK_FUNCTION_EXISTS(flock HAVE_FLOCK)
+  DCMTK_CHECK_FUNCTION_EXISTS(fork HAVE_FORK)
+  DCMTK_CHECK_FUNCTION_EXISTS(fseeko HAVE_FSEEKO)
+  DCMTK_CHECK_FUNCTION_EXISTS(ftime HAVE_FTIME)
+  DCMTK_CHECK_FUNCTION_EXISTS(geteuid HAVE_GETEUID)
+  DCMTK_CHECK_FUNCTION_EXISTS(getgrnam HAVE_GETGRNAM)
+  DCMTK_CHECK_FUNCTION_EXISTS(gethostbyaddr_r HAVE_GETHOSTBYADDR_R)
+  DCMTK_CHECK_FUNCTION_EXISTS(gethostbyname_r HAVE_GETHOSTBYNAME_R)
+  DCMTK_CHECK_FUNCTION_EXISTS(gethostid HAVE_GETHOSTID)
+  DCMTK_CHECK_FUNCTION_EXISTS(getlogin HAVE_GETLOGIN)
+  DCMTK_CHECK_FUNCTION_EXISTS(getlogin_r HAVE_GETLOGIN_R)
+  DCMTK_CHECK_FUNCTION_EXISTS(getpwnam HAVE_GETPWNAM)
+  DCMTK_CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)
+  DCMTK_CHECK_FUNCTION_EXISTS(getuid HAVE_GETUID)
+  DCMTK_CHECK_FUNCTION_EXISTS(gmtime_r HAVE_GMTIME_R)
+  DCMTK_CHECK_FUNCTION_EXISTS(localtime_r HAVE_LOCALTIME_R)
+  DCMTK_CHECK_FUNCTION_EXISTS(lockf HAVE_LOCKF)
+  DCMTK_CHECK_FUNCTION_EXISTS(lstat HAVE_LSTAT)
+  DCMTK_CHECK_FUNCTION_EXISTS(malloc_debug HAVE_MALLOC_DEBUG)
+  DCMTK_CHECK_FUNCTION_EXISTS(mkstemp HAVE_MKSTEMP)
+  DCMTK_CHECK_FUNCTION_EXISTS(nanosleep HAVE_NANOSLEEP)
+  DCMTK_CHECK_FUNCTION_EXISTS(setuid HAVE_SETUID)
+  DCMTK_CHECK_FUNCTION_EXISTS(sleep HAVE_SLEEP)
+  DCMTK_CHECK_FUNCTION_EXISTS(strlcat HAVE_STRLCAT)
+  DCMTK_CHECK_FUNCTION_EXISTS(strlcpy HAVE_STRLCPY)
+  DCMTK_CHECK_FUNCTION_EXISTS(sysinfo HAVE_SYSINFO)
+  DCMTK_CHECK_FUNCTION_EXISTS(uname HAVE_UNAME)
+  DCMTK_CHECK_FUNCTION_EXISTS(usleep HAVE_USLEEP)
+  DCMTK_CHECK_FUNCTION_EXISTS(waitpid HAVE_WAITPID)
 
   CHECK_SYMBOL_EXISTS(strcasestr "string.h" HAVE_PROTOTYPE_STRCASESTR)