<div dir="ltr">Hi Adam! <div>At least in Debian-based Linux distributions the library associated with the command <font face="arial, sans-serif"><i>-lz</i></font> is <i>zlib1g-dev</i>. </div><div><br></div><div>Best, </div><div>Ernesto</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 20 Nov 2025 at 18:47, Liu, Baowei <<a href="mailto:baowei.liu@rochester.edu" target="_blank">baowei.liu@rochester.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



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Hello Adam,
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<div>I'm afraid this issue might not be related to HDF5 but rather to a missing zlib library. If you have sysadmin privileges on the machine you use, you could try to use package managers such as apt, yum, or dnf to install zlib system-wide. Alternatively,
 you can download the source code from <a href="https://zlib.net/" target="_blank">https://zlib.net/</a>, then compile and install it -- using the same compiler you used to build Flash. Please let me know if still issues or other questions.<br>
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Thanks,</div>
<div>Baowei Liu<br>
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<div>On Nov 20, 2025, at 3:13 PM, Adam F Kowalski <Adam.F.Kowalski@Colorado.EDU> wrote:</div>
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Dear Flash users,</div>
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When I make Flash on a new machine, I get the following error:</div>
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...</div>
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owalski/myhdf5stuff/build/ci-StdShar-GNUC/HDF5-2.0.0-Linux/HDF_Group/HDF5/2.0.0/lib -lhdf5 -lz     </div>
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/usr/bin/ld: cannot find -lz</div>
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collect2: error: ld returned 1 exit status</div>
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make: *** [Makefile:384: flash4] Error 1</div>
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I'm wondering what the -lz does (can't find it through googling) and if there is another way I can link the HDF5 libraries?</div>
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Thanks,</div>
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Adam K.</div>
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