Do to the way automake works, gnuplot is built with g++ (or another C++ compiler) even when vxworks is disabled.
On a linux/gnu system this has the consequence that the gnuplot binary quite unnecessarily depends on libstdc++.so.
Things are, however, much worse on systems where there is no C++ compiler (or only a broken one).
Attached is a small patch addressing this problem. The solution is not perfect becaus automake produces warnings. The resulting src/Makefile.in is, however, correct.
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