Bugzilla Bug 171045

I do not know if this is an issue with libgd or gnuplot, but gnuplot-4.0-rc1 
does not have this issue so I filed it here.

my package.use for gnuplot specifies gd among others.

Emerging sci-visualization/gnuplot-4.2_rc1 failed to link because a symbol was
missing in libgd (sorry I did not write it down, but it was something fairly
obvious involving libgd and png support).

I was able to add the following line to my package.use:

media-libs/gd png jpeg truetype

and, after emerging gd again I was able to emerge gnuplot-4.2_rc1


Reproducible: Didn't try

Steps to Reproduce:
1. add "sci-visualization/gnuplot gd" to package.use
2. add "sci-visualization/gnuplot-4.2_rc1" to package.unmask
3. emerge gnuplot

Actual Results:  
gnuplot fails to link, install fails

Expected Results:  
gnuplot is installed

Added a check in pkg_setup(), thanks for your report.  It is in gnuplot 4.2.0
(still masked).