X-Git-Url: https://git.cworth.org/git?p=tar;a=blobdiff_plain;f=m4%2Fwctype_h.m4;h=bc6b6e791438c81de55e934b305bdd51dbe0e44c;hp=83daffc9c71110a7d2fe77cd6d40f69999676a4a;hb=ee168310ec4227174ace489bf5f81f8c2f91cde0;hpb=22f1eb8bc17e5be72dd23d42d6aaa60196ac22e6

diff --git a/m4/wctype_h.m4 b/m4/wctype_h.m4
index 83daffc..bc6b6e7 100644
--- a/m4/wctype_h.m4
+++ b/m4/wctype_h.m4
@@ -1,4 +1,4 @@
-# wctype_h.m4 serial 5
+# wctype_h.m4 serial 8
 
 dnl A placeholder for ISO C99 <wctype.h>, for platforms that lack it.
 
@@ -20,6 +20,22 @@ AC_DEFUN([gl_WCTYPE_H],
     HAVE_ISWCNTRL=0
   fi
   AC_SUBST([HAVE_ISWCNTRL])
+  AC_CHECK_FUNCS_ONCE([iswblank])
+  AC_CHECK_DECLS_ONCE([iswblank])
+  if test $ac_cv_func_iswblank = yes; then
+    HAVE_ISWBLANK=1
+    REPLACE_ISWBLANK=0
+  else
+    HAVE_ISWBLANK=0
+    if test $ac_cv_have_decl_iswblank = yes; then
+      REPLACE_ISWBLANK=1
+    else
+      REPLACE_ISWBLANK=0
+    fi
+  fi
+  AC_SUBST([HAVE_ISWBLANK])
+  AC_SUBST([REPLACE_ISWBLANK])
+
   AC_CHECK_HEADERS_ONCE([wctype.h])
   AC_REQUIRE([AC_C_INLINE])