1 files changed, 9 insertions, 1 deletions
diff --git a/enc/unicode/case-folding.rb b/enc/unicode/case-folding.rb
index 2b503ad65f..ef97baf737 100755
--- a/enc/unicode/case-folding.rb
+++ b/enc/unicode/case-folding.rb
@@ -155,8 +155,16 @@ class CaseFolding
     dest.print("/* DO NOT EDIT THIS FILE. */\n")
     dest.print("/* Generated by enc/unicode/case-folding.rb */\n\n")
 
+    versions = version.scan(/\d+/)
+    dest.print("#if defined ONIG_UNICODE_VERSION_STRING && !( \\\n")
+    %w[MAJOR MINOR TEENY].zip(versions) do |n, v|
+      dest.print("      ONIG_UNICODE_VERSION_#{n} == #{v} && \\\n")
+    end
+    dest.print("      1)\n")
+    dest.print("# error ONIG_UNICODE_VERSION_STRING mismatch\n")
+    dest.print("#endif\n")
     dest.print("#define ONIG_UNICODE_VERSION_STRING #{version.dump}\n")
-    %w[MAJOR MINOR TEENY].zip(version.scan(/\d+/)) do |n, v|
+    %w[MAJOR MINOR TEENY].zip(versions) do |n, v|
       dest.print("#define ONIG_UNICODE_VERSION_#{n} #{v}\n")
     end
     dest.print("\n")