Hi all, mod_wsgi is great, thank you Graham.

I had(still have apart from below) a working rhel7, httpd2.4, python 
install with conda via mod_wsgi.

Then I tried to use opencv.

everything runs fine from the conda command line.

ldd for the python/lib/libpng16 shows correct linking with python/lib/libz 
(1.2.11)

however apache throws an error on 'import opencv', reporting libz 1.2.9 
required as its seems to use the libz loaded by httpd (/lib64/libz) which 
for RHEL7 is 1.2.7.

(/lib64/libz.so.6: version ZLIB_1.2.9 required by 
/opt/miniconda/lib/libpng16.so.16)

I can work around this by using LD_PRELOAD=python/lib/libz /bin/httpd and 
everything works, but I can't figure out how to get the same to work for 
systemctl (since LD_PRELOAD is ignored by design)

Any pointers as to how to fix this? I suspect it to be a bug in the libpng 
build but I'm not sure.

Thanks

Alaister

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