Install[] of working WSTP executable hangs, Mathematica 10.1, linux

I am trying to use WSTP to link to the addtwo.c function example that comes with Mathematica. I have compiled addtwo successfully (took an effort) and if I run it in the command line I can connect it to Mathematica and use it. However running

Install["./addtwo"]

in Mathematica just hangs until I abort. The precompiled addtwo binary that comes with Mathematica does install fine. Is there a way to find out more about why the Install[] fails?

I compiled using the (adapted) makefile which produces:

:~$ make addtwo
/usr/local/Wolfram/Mathematica/10.1/SystemFiles/Links/WSTP/DeveloperKit/Linux-x86-64/CompilerAdditions/wsprep addtwo.tm -o addtwotm.c
gcc -c -I/usr/local/Wolfram/Mathematica/10.1/SystemFiles/Links/WSTP/DeveloperKit/Linux-x86-64/CompilerAdditions addtwotm.c
gcc -c -I/usr/local/Wolfram/Mathematica/10.1/SystemFiles/Links/WSTP/DeveloperKit/Linux-x86-64/CompilerAdditions addtwo.c
gcc -I/usr/local/Wolfram/Mathematica/10.1/SystemFiles/Links/WSTP/DeveloperKit/Linux-x86-64/CompilerAdditions addtwotm.o addtwo.o -L/usr/local/Wolfram/Mathematica/10.1/SystemFiles/Links/WSTP/DeveloperKit/Linux-x86-64/CompilerAdditions -lWSTP64i4 -lm -lpthread -lrt -lstdc++ -ldl -luuid -lWSTP64i4  -o addtwo

Note that addition of -lWSTP64i4 didn't change anything, I tried it because of this answer which was already a bit desperate.

Could it be because of my gcc version? ( 4.6.3-1ubuntu5 )

Answer

Summarizing the comments into an answer: this is really the same issue as in WSTP hangs in Mathematica 10.2.

If using dynamic linking (-lWSTP64i4 will pick up the .so library by default), then said shared library should be copied to a systemwide location or put on LD_LIBRARY_PATH.

The prebuilt examples do not exhibit this behavior because they are statically linked. The same can be accomplished by using -L${LIBDIR} libWSTP64i4.a in your link line.

If one uses the MathLink examples instead, they will work without additional requirements even if dynamically linked. The reason is that when Mathematica is started, it adds to LD_LIBRARY_PATH the $InstallationDirectory/SystemFiles/Libraries/$SystemID directory, which has a copy of the corresponding MathLink libraries, libML32i4.so and libML64i4.so.

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