Hi I am interested in learning apl and was delighted to find your site about GNU APL.
I am using Ubuntu 22.04.1 (64 bit on an i3 machine). I didn't have subversion but installed it without any problems using apt. I already had gcc installed. I then downloaded the apl source code using this command: $ svn checkout http://svn.savannah.gnu.org/svn/apl/trunk This created a folder called trunk. I used 'cd trunk' to get into the folder and, having read the readme and install files, tried to build apl using this command: $ ./configure && make && make install The process compiled quite a lot of source files but stopped with a fatal error while trying to compile Quad_PNG.cc. The fatal error was caused by not having png.h. This is the third include in the .cc file. The file isn't amongst the source files, should it be somewhere else? Could you advise me please on how to fix this problem? Thank you. Kind regards Steve Clay
