https://sourceforge.net/p/linuxquota/patches/56/

configure: WARNING: tcpd.h not found
./configure: 8453: test: X: unexpected operator
checking that generated files are newer than configure... done
--- a/configure.ac
+++ b/configure.ac
@@ -283,7 +283,7 @@ AC_ARG_WITH([pid-dir],
     [AS_HELP_STRING([--with-pid-dir=DIRECTORY], [Create PID files in this directory instead of /var/run])],
     [with_pid_dir="$withval"]
 )
-AS_IF([test "X$with_pid_dir" == "X" -o "$with_pid_dir" == "yes" -o "$with_pid_dir" == "no"],[
+AS_IF([test "X$with_pid_dir" = "X" -o "$with_pid_dir" = "yes" -o "$with_pid_dir" = "no"],[
     with_pid_dir="/var/run"
 ])
 AC_DEFINE_UNQUOTED([PID_DIR], ["$with_pid_dir"], [Directory for PID files])