gl_CHECK_NEXT_HEADERS implies AC_CHECK_HEADERS_ONCE

[gnulib.git] / m4 / include_next.m4

diff --git a/m4/include_next.m4 b/m4/include_next.m4
index 2b20a76..b3c7849 100644 (file)
--- a/m4/include_next.m4
+++ b/m4/include_next.m4
@@ -147,6 +147,9 @@ choke me
 # Note: This macro assumes that the header file is not empty after
 # preprocessing, i.e. it does not only define preprocessor macros but also
 # provides some type/enum definitions or function/variable declarations.
+#
+# This macro also checks whether each header exists, by invoking
+# AC_CHECK_HEADERS_ONCE or AC_CHECK_HEADERS on each argument.
 AC_DEFUN([gl_CHECK_NEXT_HEADERS],
 [
   gl_NEXT_HEADERS_INTERNAL([$1], [check])