Missing freetype development files when try to compile wine 32 on 64 bit slack.
on my case:
configure:12631: freetype2 cflags: -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include
Error was missing function in zlib called from: libpng16
i just update zlib to last version and everything goes ok.
I use 64 bit slackware with multilib
so i upgrade with:
convertpkg-compat32 -i zlib-1.2.11-i586-1.txz