message: Disabling -O3, it caused crashes w/ gcc 5.4
diff: @@ -14,8 +14,8 @@ AC_COPYRIGHT([Copyright (C) 2005-2016 Christoph Rupp (chris@crupp.de)])
  AC_CANONICAL_HOST
  AC_ENABLE_SHARED
  AC_ENABLE_STATIC
  -: ${CFLAGS="-O3 -DNDEBUG"}
  -: ${CXXFLAGS="-O3 -DNDEBUG"}
  +: ${CFLAGS="-DNDEBUG"}
  +: ${CXXFLAGS="-DNDEBUG"}
  AC_PROG_CC
  AC_PROG_CC_STDC
  AC_PROG_CXX
  