How to specify a different path for gnuplot.gih

[Per P. <per...@ma...>]

Hi,
there was a small problem with the way I built gnuplot for my binary 
installer.
I naively install gnuplot into a dir and then copy the contents to the 
installer. The path to gnuplot.gih gets hardwired to that install 
location. Setting --with-gihdir= didn't help, since it then tries to 
install gnuplot.gih at that location.

How do other people deal with this?
Skipping the install phase and just copy the files from the built 
sources?
Or, is there packaging support in the makefiles that I'm missing?

/Per