Merge from coreutils.

[gnulib.git] / m4 / group-member.m4

diff --git a/m4/group-member.m4 b/m4/group-member.m4
index 69498e4..bfef480 100644 (file)
--- a/m4/group-member.m4
+++ b/m4/group-member.m4
@@ -1,11 +1,23 @@
-#serial 2
+#serial 5
 
 dnl Written by Jim Meyering
 
-AC_DEFUN(jm_FUNC_GROUP_MEMBER,
-  [
-    dnl Do this replacement check manually because I want the hyphen
-    dnl (not the underscore) in the filename.
-    AC_CHECK_FUNC(group_member, , [AC_LIBOBJ(group-member)])
-  ]
-)
+AC_DEFUN([jm_FUNC_GROUP_MEMBER],
+[
+  dnl Persuade glibc <unistd.h> to declare group_member().
+  AC_REQUIRE([AC_GNU_SOURCE])
+
+  dnl Do this replacement check manually because I want the hyphen
+  dnl (not the underscore) in the filename.
+  AC_CHECK_FUNC(group_member, , [
+    AC_LIBOBJ(group-member)
+    gl_PREREQ_GROUP_MEMBER
+  ])
+])
+
+# Prerequisites of lib/group-member.c.
+AC_DEFUN([gl_PREREQ_GROUP_MEMBER],
+[
+  AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_REQUIRE([AC_FUNC_GETGROUPS])
+])