tests/1 execution fails when compiled/run as recommended

Using a fresh clone, the test fails.  Minimum Working Example command lines:

```
$ cd tests; g++ -o 1 -L../lib test.cpp -lquickgl -lglut
$ ./1
./1: error while loading shared libraries: libquickgl.so: cannot open shared object file: No such file or directory
$ ls ../lib/libquickgl.so
../lib/libquickgl.so

```