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diff --git a/ChangeLog b/ChangeLog
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+2023-04-25  Bruno Haible  <bruno@clisp.org>
+
+	dfa tests: Fix compilation error (regression 2023-04-22).
+	* tests/test-dfa-match-aux.c: Include unistd.h.
+	* modules/dfa-tests (Depends-on): Add unistd.
+
 2023-04-24  Bruno Haible  <bruno@clisp.org>
 
 	tests: Suppress ‘#pragma GCC diagnostic’ warnings with GCC < 13.