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diff --git a/zconf.h.cmakein b/zconf.h.cmakein
index a7f24cc..a1b359b 100644
--- a/zconf.h.cmakein
+++ b/zconf.h.cmakein
@@ -434,11 +434,19 @@ typedef uLong FAR uLongf;
#endif
#ifdef HAVE_UNISTD_H /* may be set to #if 1 by ./configure */
-# define Z_HAVE_UNISTD_H
+# if ~(~HAVE_UNISTD_H + 0) == 0 && ~(~HAVE_UNISTD_H + 1) == 1
+# define Z_HAVE_UNISTD_H
+# elif HAVE_UNISTD_H != 0
+# define Z_HAVE_UNISTD_H
+# endif
#endif
#ifdef HAVE_STDARG_H /* may be set to #if 1 by ./configure */
-# define Z_HAVE_STDARG_H
+# if ~(~HAVE_STDARG_H + 0) == 0 && ~(~HAVE_STDARG_H + 1) == 1
+# define Z_HAVE_STDARG_H
+# elif HAVE_STDARG_H != 0
+# define Z_HAVE_STDARG_H
+# endif
#endif
#ifdef STDC
diff --git a/zconf.h.in b/zconf.h.in
index 5e1d68a..32f53c8 100644
--- a/zconf.h.in
+++ b/zconf.h.in
@@ -432,11 +432,19 @@ typedef uLong FAR uLongf;
#endif
#ifdef HAVE_UNISTD_H /* may be set to #if 1 by ./configure */
-# define Z_HAVE_UNISTD_H
+# if ~(~HAVE_UNISTD_H + 0) == 0 && ~(~HAVE_UNISTD_H + 1) == 1
+# define Z_HAVE_UNISTD_H
+# elif HAVE_UNISTD_H != 0
+# define Z_HAVE_UNISTD_H
+# endif
#endif
#ifdef HAVE_STDARG_H /* may be set to #if 1 by ./configure */
-# define Z_HAVE_STDARG_H
+# if ~(~HAVE_STDARG_H + 0) == 0 && ~(~HAVE_STDARG_H + 1) == 1
+# define Z_HAVE_STDARG_H
+# elif HAVE_STDARG_H != 0
+# define Z_HAVE_STDARG_H
+# endif
#endif
#ifdef STDC
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