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// foo.c
// represents the XS lib referencing a symbol (lgamma) in an external 
+library libm.so
...
    dlclose(so);
    exit(0);
}

gcc -c -fPIC foo.c                      # compile
gcc -shared -o Foo.so foo.o             # create/link shared library F
+oo.so

gcc -rdynamic -o mytest mytest.c -ldl   # create wrapper executable wh
+ich loads Foo.so

$ LD_LIBRARY_PATH=. ./mytest
dynamically loading 'Foo.so'...
./mytest: symbol lookup error: ./Foo.so: undefined symbol: lgamma

$ gcc -shared -o Foo.so foo.o  -lm
$ LD_LIBRARY_PATH=. ./mytest
dynamically loading 'Foo.so'...
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