--- a/Modules/ThirdParty/VNL/src/vxl/vcl/vcl_compiler.h
+++ b/Modules/ThirdParty/VNL/src/vxl/vcl/vcl_compiler.h
@@ -43,85 +43,7 @@
 #endif
 
 #if defined(__GNUC__) && !defined(__ICC) // icc 8.0 defines __GNUC__
-# define VCL_GCC
-# if (__GNUC__ < 4)
-#  error "forget it."
-# elif (__GNUC__==4)
-#  define VCL_GCC_4
-#  if (__GNUC_MINOR__ > 0 )
-#   define VCL_GCC_41
-#  else
-#   define VCL_GCC_40
-#  endif
-# elif (__GNUC__==5)
-#  define VCL_GCC_5
-#  if (__GNUC_MINOR__ > 2 )
-#   define VCL_GCC_53
-#  elif (__GNUC_MINOR__ > 1 )
-#   define VCL_GCC_52
-#  elif (__GNUC_MINOR__ > 0 )
-#   define VCL_GCC_51
-#  else
-#   define VCL_GCC_50
-#  endif
-# elif (__GNUC__==6)
-#  define VCL_GCC_6
-#  if (__GNUC_MINOR__ > 2 )
-#   define VCL_GCC_63
-#  elif (__GNUC_MINOR__ > 1 )
-#   define VCL_GCC_62
-#  elif (__GNUC_MINOR__ > 0 )
-#   define VCL_GCC_61
-#  else
-#   define VCL_GCC_60
-#  endif
-# elif (__GNUC__==7)
-#  define VCL_GCC_7
-#  if (__GNUC_MINOR__ > 2 )
-#   define VCL_GCC_73
-#  elif (__GNUC_MINOR__ > 1 )
-#   define VCL_GCC_72
-#  elif (__GNUC_MINOR__ > 0 )
-#   define VCL_GCC_71
-#  else
-#   define VCL_GCC_70
-#  endif
-# elif (__GNUC__==8)
-#  define VCL_GCC_8
-#  if (__GNUC_MINOR__ > 2 )
-#   define VCL_GCC_83
-#  elif (__GNUC_MINOR__ > 1 )
-#   define VCL_GCC_82
-#  elif (__GNUC_MINOR__ > 0 )
-#   define VCL_GCC_81
-#  else
-#   define VCL_GCC_80
-#  endif
-# elif (__GNUC__==9)
-#  define VCL_GCC_9
-#  if (__GNUC_MINOR__ > 2 )
-#   define VCL_GCC_93
-#  elif (__GNUC_MINOR__ > 1 )
-#   define VCL_GCC_92
-#  elif (__GNUC_MINOR__ > 0 )
-#   define VCL_GCC_91
-#  else
-#   define VCL_GCC_90
-#  endif
-# elif (__GNUC__==10)
-#  define VCL_GCC_10
-#  if (__GNUC_MINOR__ > 2 )
-#   define VCL_GCC_103
-#  elif (__GNUC_MINOR__ > 1 )
-#   define VCL_GCC_102
-#  elif (__GNUC_MINOR__ > 0 )
-#   define VCL_GCC_101
-#  else
-#   define VCL_GCC_100
-#  endif
-# else
-#  error "Dunno about this gcc"
-# endif
+# define VCL_GCC_73
 #endif
 
 #if defined(_WIN32) || defined(WIN32)
--- a/Modules/ThirdParty/VNL/src/vxl/vcl/tests/test_preprocessor.cxx
+++ b/Modules/ThirdParty/VNL/src/vxl/vcl/tests/test_preprocessor.cxx
@@ -64,6 +64,12 @@
   ++minor_count;
 #endif
 
+#ifdef VCL_GCC_73
+  ++compiler_count;
+  ++major_count;
+  ++minor_count;
+#endif
+
 #ifdef VCL_VC
   ++compiler_count;
 #endif