Config.m4 help

I'm finally trying to tackle an improvement in the config.m4 for my tuxedo module. Previously, I've just hacked my way from other config.m4 scripts until it did what I wanted. But now I need it to get fancy. The problem comes because the raw Tuxedo libraries and the linking required to use them seems to vary with each Tux version. However, they provide a utility they expect people to use to link a client program (buildclient) which has a verbose option that prints the details of its compile/link command. (I can't just use it solely because it assumes its to build a executable program, not a dynamic library). So if I can get the config.m4 script to execute a sequence like: buildclient -v -w -f simple_sample.c The first line it outputs would look like: cc -I $TUXDIR/include -o a.out -L{$TUXDIR}/lib simple_sample.c -lwsc -lbuft -lwsc -lgpnet -lfml -lfml32 -lengine -ldl -lpthread /usr/lib/libcrypt.a (plus some other lines)... But this output will vary with at least 2 or 3 different versions of Tuxedo, hence I can't just hardcode the m4 file. I need to capture all the -l lines, and take those to create my PHP_ADD_LIBRARY and TUXEDO_LIBS lines for the config.m4. This is how, given the Tuxedo version provided, I should link a program. From there, the rest of the buldconf process will take over just fine. My experience with m4, very little. My knowledge of exactly what those m4 macros like PHP_ADD_LIBRARY do ... very little also. Does anyone have any ideas or places I can start to work this out? Much appreciated. Brian