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Compiling gives the following error, since the library is specified
before the local objects:
$ make
[…]
cc -lpng16 build/main.o build/ql.o build/loadpng.o -o build/qlprint
/usr/bin/ld: build/loadpng.o: in function `loadpng':
…/src/loadpng.c:30: undefined reference to `png_sig_cmp'
/usr/bin/ld: …/src/loadpng.c:35: undefined reference to `png_create_read_struct'
/usr/bin/ld: …/src/loadpng.c:39: undefined reference to `png_create_info_struct'
/usr/bin/ld: …/src/loadpng.c:43: undefined reference to `png_create_info_struct'
[…]
collect2: error: ld returned 1 exit status
make: *** [Makefile:28: build/qlprint] Error 1
After reordering:
$ make
[…]
cc build/main.o build/ql.o build/loadpng.o -lpng16 -o build/qlprint
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