build issue on debian about laz-perf

[epifanio]

Thanks @connormanning for the quick fix!

build log with default cmake options with sharedlib ON:

Scanning dependencies of target point10
[  4%] Building CXX object examples/CMakeFiles/point10.dir/point10.cpp.o
[  9%] Linking CXX executable point10
[  9%] Built target point10
Scanning dependencies of target simple
[ 13%] Building CXX object examples/CMakeFiles/simple.dir/simple.cpp.o
[ 18%] Linking CXX executable simple
[ 18%] Built target simple
Scanning dependencies of target readlaz
[ 22%] Building CXX object examples/CMakeFiles/readlaz.dir/readlaz.cpp.o
[ 27%] Linking CXX executable readlaz
[ 27%] Built target readlaz
Scanning dependencies of target dynamic
[ 31%] Building CXX object examples/CMakeFiles/dynamic.dir/dynamic.cpp.o
[ 36%] Linking CXX executable dynamic
[ 36%] Built target dynamic
Scanning dependencies of target brute
[ 40%] Building CXX object benchmarks/CMakeFiles/brute.dir/brute.cpp.o
[ 45%] Linking CXX executable brute
[ 45%] Built target brute
Scanning dependencies of target brute_point10
[ 50%] Building CXX object benchmarks/CMakeFiles/brute_point10.dir/brute_point10.cpp.o
[ 54%] Linking CXX executable brute_point10
[ 54%] Built target brute_point10
Scanning dependencies of target gtest
[ 59%] Building CXX object test/gtest/gtest-1.7.0/CMakeFiles/gtest.dir/src/gtest-all.cc.o
[ 63%] Linking CXX shared library libgtest.so
[ 63%] Built target gtest
Scanning dependencies of target io_tests
[ 68%] Building CXX object test/CMakeFiles/io_tests.dir/io_tests.cpp.o
[ 72%] Linking CXX executable io_tests
CMakeFiles/io_tests.dir/io_tests.cpp.o: In function `makeTempFileName[abi:cxx11]()':
/home/epinux/dev/laz-perf/test/io_tests.cpp:56: warning: the use of `tmpnam' is dangerous, better use `mkstemp'
[ 72%] Built target io_tests
Scanning dependencies of target stream_tests
[ 77%] Building CXX object test/CMakeFiles/stream_tests.dir/stream_tests.cpp.o
[ 81%] Linking CXX executable stream_tests
[ 81%] Built target stream_tests
Scanning dependencies of target lazperf_tests
[ 86%] Building CXX object test/CMakeFiles/lazperf_tests.dir/lazperf_tests.cpp.o
[ 90%] Linking CXX executable lazperf_tests
[ 90%] Built target lazperf_tests
Scanning dependencies of target gtest_main
[ 95%] Building CXX object test/gtest/gtest-1.7.0/CMakeFiles/gtest_main.dir/src/gtest_main.cc.o
[100%] Linking CXX shared library libgtest_main.so
[100%] Built target gtest_main

[connormanning]

Pushed a possible fix for this - please pull and retry.