Issue #20306: The pw_gecos and pw_passwd fields are not required by POSIX.
If they aren't present, set them to an empty string.
diff --git a/configure.ac b/configure.ac
index 7a6b5be..bfd2b04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3762,6 +3762,10 @@
AC_CHECK_MEMBERS([struct stat.st_gen])
AC_CHECK_MEMBERS([struct stat.st_birthtime])
AC_CHECK_MEMBERS([struct stat.st_blocks])
+AC_CHECK_MEMBERS([struct passwd.pw_gecos, struct passwd.pw_passwd], [], [], [[
+ #include <sys/types.h>
+ #include <pwd.h>
+]])
AC_MSG_CHECKING(for time.h that defines altzone)
AC_CACHE_VAL(ac_cv_header_time_altzone,[