flightgear/README.autoconf

Flight Gear uses the Gnu autoconf and automake tools for managing
Makefiles.  It also uses libtool to manage building shared and static
libraries.  Key input files for this system are:

    configure.in - Top level directory
    Makefile.am - One in each subdirectory
    Include/config.in - input file for building config.h

If you need to modify any of these files, you will need to build and
install the following packages:

    - GNU autoconf 2.12 (available from ftp://prep.ai.mit.edu/pub/gnu)
    - GNU automake 1.2h (available from ftp://ftp.cygnus.com/pub/tromey)

Libtool is not currently used:

    - GNU libtool 1.2   (available from ftp://prep.ai.mit.edu/pub/gnu)
                        (or maybe ftp://alpha.gnu.org/gnu)
    - After upgrading libtool, if we were using it, you would want to run:

      libtoolize --force

When making a change to any of these files you will need to run:

    aclocal ; automake -a ; autoconf

Then follow the regular build procedure:

    ./configure; make; make install

For debuging purposes you might want to try something like:

    CFLAGS=-Wall CXXFLAGS=-Wall ./configure; make; make install

For full optimization using the EGCS compiler on an Intel processor you 
could try something like:

    MACH="-mpentium"   # -m486 -mpentiumpro etc.
    export CC=egcc     # for Linux
    export CFLAGS="-Wall -O5 -fomit-frame-pointer -ffast-math -funroll-loops $MACH"
    export CXXFLAGS="-Wall -O5 -fomit-frame-pointer -ffast-math -funroll-loops $MACH"
    ./configure