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Hi Pete, Have you tried to install and use the Fedora Core RPM? rpm -ivh https://www.unidata.ucar.edu/downloads/gempak/latest/gempak-7.4.2-1.fc26.x86_64.rpm For the source build, the message /usr/lib64/libpng16.so.16: undefined reference to `inflateValidate@ZLIB_1.2.9 seems to indicate a conflict between system libpng and GEMPAK libpng (built as part of extlibs). What is returned by these commands: 1) ldd /usr/lib64/libpng16.so.16 2) rpm -qa |grep libpng 3) rpm -qa |grep zlib > Greetings. Installing NAWIPS 7.4.2 in FEDORA 27. Following install > instructions and after untarring, sourcing, installing all libraries, and > executing a “make everything” per > https://www.unidata.ucar.edu/software/gempak/doc/install.html am receiving > the error “/usr/lib64/libpng16.so.16: undefined reference to > `inflateValidate@ZLIB_1.2.9’” which prevents the final compilation of about > 18 key executables such as nmap2. All other executables are produced and > function as expected. > > Could not find any similar entry in the Support Archives related to this > issue. There are a few hits on Google but are too arcane or have no > meaningful suggested solutions. > > The captured output and error log for “make everything” is attached as > “me8.log” for reference (8 for “make everything - try number 8”) > Ticket Details =================== Ticket ID: JGJ-128620 Department: Support GEMPAK Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.