diff -ur bison-3.8.2.orig/m4/libtextstyle-optional.m4 bison-3.8.2/m4/libtextstyle-optional.m4
--- bison-3.8.2.orig/m4/libtextstyle-optional.m4	2021-03-10 06:41:25.000000000 +0100
+++ bison-3.8.2/m4/libtextstyle-optional.m4	2022-08-28 12:38:58.097300031 +0200
@@ -21,14 +21,9 @@
 
 AC_DEFUN([gl_LIBTEXTSTYLE_OPTIONAL],
 [
-  gl_LIBTEXTSTYLE([$1])
-  if test $HAVE_LIBTEXTSTYLE = yes; then
-    TEXTSTYLE_H=
-  else
-    TEXTSTYLE_H=textstyle.h
-    AC_REQUIRE([AC_C_INLINE])
-    AC_CHECK_FUNCS_ONCE([tcdrain])
-  fi
+  TEXTSTYLE_H=textstyle.h
+  AC_REQUIRE([AC_C_INLINE])
+  AC_CHECK_FUNCS_ONCE([tcdrain])
   AC_SUBST([TEXTSTYLE_H])
   AM_CONDITIONAL([GL_GENERATE_TEXTSTYLE_H], [test -n "$TEXTSTYLE_H"])
 ])