The call to the PKG_PROG_PKG_CONFIG macro has parentheses, which are unnecessary. This patch removes the parentheses. --- a/configure.in +++ b/configure.in @@ -48,7 +48,7 @@ AF_INIT_D() AC_SUBST(initdir) AF_PID_D() AC_SUBST(piddir) -PKG_PROG_PKG_CONFIG() +PKG_PROG_PKG_CONFIG # # Check for systemd unit files direectory exists if unit file installation