Patch #439995 (slightly modified from the uploaded version):
Work around Linux's nonstandard nice() systemcall, which does not return the
new priority.
This closes SF bug #439990.
diff --git a/configure.in b/configure.in
index c7bfe6a..6359a46 100644
--- a/configure.in
+++ b/configure.in
@@ -1175,7 +1175,7 @@
setlocale setregid setreuid setsid setpgid setuid setvbuf \
sigaction siginterrupt sigrelse strftime strptime symlink sysconf \
tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
- truncate uname waitpid _getpty)
+ truncate uname waitpid _getpty getpriority)
# check for openpty and forkpty