Looks like at least the immediate problem (not to say there might not be others) is that strnlen() is missing on Snow Leopard.
When this came up for something else before, some magic known as snowleopard_fixes took care of it, according to old email. I gather that supplies the functions missing on Snow Leopard that are relatively straightforward to re-create and have been helpful getting ports to build there. How might that magic be added to the Portfile for netpbm? Ticket #55716 filed. :info:build sldtoppm.c:218:17: warning: implicit declaration of function 'strnlen' is invalid in C99 [-Wimplicit-function-declaration] :info:build if (strnlen(slideName, 32) == 32) :info:build ^ :info:build 1 warning generated. :info:build sldtoppm.c:218:17: warning: implicit declaration of function 'strnlen' is invalid in C99 [-Wimplicit-function-declaration] :info:build if (strnlen(slideName, 32) == 32) :info:build ^ [...] :info:build /opt/local/bin/clang-mp-3.9 -o sldtoppm sldtoppm.o -L/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_netpbm/netpbm/work/advanced/lib -lnetpbm -L/opt/local/lib -Wl,-headerpad_max_install_names -arch x86_64 -arch i386 -lm :info:build Undefined symbols for architecture x86_64: :info:build "_strnlen", referenced from: :info:build _main in sldtoppm.o :info:build ld: symbol(s) not found for architecture x86_64 :info:build clang: error: linker command failed with exit code 1 (use -v to see invocation)
