I am trying to build Firebird release 1.5.1 on RedHat Linux 7, and
get the following error when running autoconf:

configure.in:165: error: possibly undefined macro: AC_PROG_LIBTOOL
configure.in:166: error: possibly undefined macro: AC_LIBTOOL_DLOPEN
configure.in:167: error: possibly undefined macro:
AC_LIBTOOL_WIN32_DLL

I have upgraded to autoconf 2.53 since before that I got the message
that it required autoconf 2.53 or better when I tried to configure
the package originally.

Any ideas? I need to build firebird for my machine since the pre-
built binary for Linux requires newer C libraries than my system has.

Regards,
Marlena Miller