it's a curious script, all in one stuff using with that here tag for input to cat.. i wouldnt do it like this, considering it's for a buildscript and sbo && slackware have a similar standard that is not this!
aside from that it looks fine
/* personally i would just rip stuff out from this and write teh buildscript myself, finally submit it to sbo if i was in need of this. */
a good rule of thumb is simply comparing to other build scripts, anything really:
i don't know why it isent taking advantage of the install clp for the makefile, since as your buildscript shows me the src also supports the DESTDIR variable.. it would make stuff and things "duhhhh" less thinking!!
it might of gave a bad example but in general stuff like this helps confirm and reduces questions!