Here come first ideas:
$ firefoxftp://ftp.info-zip.org/pub/infozip/src/zip30.tgz$ cd ./zip30
 
$ make -f unix/Makefile generic# su
# make -f unix/Makefile install # cd /usr/pkg/bin && for i in zip* ; do mv $i $i.bak ; done # cd /usr/bin && for i in unzip* ; do mv $i $i.bak ; done
 
$ which zip 
/usr/local/bin/zip
$ which unzip
/usr/local/bin/unzip
cd /usr/pkgsrc/wip/slim/work/slim-1.3.1
    gsed 's@png_ptr->jmpbuf@png_jmpbuf(png_ptr)@g' -i png.c
    gsed 's@-lpng12@-lpng16@g' -i Makefile
cd /usr/pkgsrc/wip/slim
    gsed 's@-lpng15@-lpng16@g' -i Makefile
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