-------------------------------------------
20 Jun 2024 -- weird hard-to-reproduce crash from MacOS 10.6 compile
-------------------------------------------

I have long been compiling without problems
on MacOS 10.6 for super-max compatibility.
However, I recently noticed some occasional
difficult-to-reproduce crashes of tksurfer on
startup on MacOS 10.15 (OpenGL window briefly
appears then disappears).  Once tksurfer is up,
I have never experienced a crash.

But until I get to the bottom of this, I put
a MacOS 10.15 compile of tksurfer here (which
doesn't have the occasional startup crash) here:

  https://pages.ucsd.edu/~msereno/csurf/tmp/tksurfer-240619-compile1015

To use this, download it to say, /tmp, and do
something like this:

  cd $CSURF_DIR/bin/Darwin-x86_64           # go to Mac-specific binaries
  cp tksurfer tksurfer-240619-compile106    # cp/rename 10.6 binary
  cp /tmp/tksurfer-240619-compile1015 .     # add 10.15 binary
  cp tksurfer-240619-compile1015 tksurfer   # cp 10.15 to bare 'tksurfer'

To revert to the 10.6 compile:

  cd $CSURF_DIR/bin/Darwin-x86_64           # go to Mac-specific
  cp tksurfer-240619-compile106 tksurfer    # cp 10.6 to bare 'tksurfer'