-#serial 2
+#serial 4
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_REQUIRE([AC_HEADER_STDC])
+ AC_CHECK_HEADERS_ONCE(unistd.h)
+ AC_REQUIRE([AC_FUNC_GETGROUPS])
+])