LD_LIBRARY_PATH is the path where the dynamic loader (ld.so and ld-linux.so on Linux, dyld on OS X) looks up libraries. You need this when you run programs that depend on libraries in non-standard paths.
It doesn’t necessarily influence where the linker finds libraries. Use the -L flag to specify the search path for ld:
ld -L/opt/gurobi701/linux64/lib -lgurobi_c++ ...
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solved ld ignores additional pathes