Am 16.09.25 um 16:44 schrieb Marco van Hulten:
> Hello 
> 
> I've added a port for ncview, something to view netCDF files.
> 
> Building and installing works.  I can open some netCDF files, but not
> all of them.  I'll have a deeper look into that.
> 
> Clang fails on undefined symbols, even as header files are included, so
> I needed to set COMPILER to port-gcc only.  Without that override,
> including weird patches like the one attached brings the compilation
> further.  In the end it still fails on symbol 'main' not found.
> 
> I tried to reproduce this issue in a very simple header, file with
> function and file calling function combination, but of course that's
> too simple to reproduce the problem.
> 
> I don't know if the problem is worth tackling of it works with gcc.
> 
> Thanks for insights.

Errors in configure for me:

checking /usr/local/include/png.h usability... yes
checking /usr/local/include/png.h presence... yes
checking for /usr/local/include/png.h... yes
Using user-specified png include dir=/usr/local/include
checking for /usr/local/lib/libpng.so... no
Error: user specified png library directory does not have libpng.so !
*** Error 1 in /home/martin/ports/geo/ncview
(/home/martin/ports/infrastructure/mk/bsd.port.mk:3030 'do-configure':
@for d in /home/martin/p...)
*** Error 2 in . (/home/martin/ports/infrastructure/mk/bsd.port.mk:3050
'/home/martin/ports/pobj/ncview-2.1.11/build-amd64/.configure_done')
*** Error 2 in /home/martin/ports/geo/ncview
(/home/martin/ports/infrastructure/mk/bsd.port.mk:2712 'all':
@lock=ncview-2.1.11;  export _LOC...)

The configure test here should account for the library version in the
filename. Something like:

<snip>
#if test -r "$PNG_LIBDIR/$PNG_LIBNAME"; then
if test -n "$(find $PNG_LIBDIR -maxdepth 1 -name $PNG_LIBNAME* -print)";
then
</snip>

Also, I would prefer the port to work with the in-tree compiler.