Another fix is needed, for the 'libtextstyle-optional' module.
Uncovered by the continuous integration.
2021-12-18 Bruno Haible <br...@clisp.org>
libtextstyle-optional: Fix generation of textstyle.h (regr. 2021-12-15).
* m4/libtextstyle-optional.m4 (gl_LIBTEXTSTYLE_OPTIONAL): Invoke
gl_CONDITIONAL_HEADER.
diff --git a/m4/libtextstyle-optional.m4 b/m4/libtextstyle-optional.m4
index 74a5aeaf2..2b29ae4a5 100644
--- a/m4/libtextstyle-optional.m4
+++ b/m4/libtextstyle-optional.m4
@@ -1,4 +1,4 @@
-# libtextstyle-optional.m4 serial 3
+# libtextstyle-optional.m4 serial 4
dnl Copyright (C) 2019-2021 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -29,4 +29,11 @@ AC_DEFUN([gl_LIBTEXTSTYLE_OPTIONAL],
AC_REQUIRE([AC_C_INLINE])
AC_CHECK_FUNCS_ONCE([tcdrain])
fi
+
+ dnl Update the value of the TEXTSTYLE_H variable and the
+ dnl GL_GENERATE_TEXTSTYLE_H conditional.
+ dnl In most modules, the gl_CONDITIONAL_HEADER invocation belongs in the
+ dnl module description, not the .m4 file. But here it's OK, because it does
+ dnl not make sense to AC_REQUIRE([gl_LIBTEXTSTYLE_OPTIONAL]).
+ gl_CONDITIONAL_HEADER([textstyle.h])
])
