I am trying to install pngnq, which relies on libpng >= 1.2.8. I have installed libpng 1.5.7 via ./configure, make, sudo make install (without problems), because the libpng version in the Software Center was too old. I am now trying to install pngnq via ./configure, make, sudo make install (again, because Software Center version is too old), but am getting stuck at the make step on error messages which I believe pertain to libpng linking. A small sample of the error messages:
undefined reference to `png_destroy_write_struct'
undefined reference to `png_convert_from_time_t'
undefined reference to `png_set_PLTE'
I have limited experience with installing software manually on Linux, and so am not really sure what the next step is in diagnosing the problem. I've done substantial searching, but haven't really found anything targeted at the issue I'm having. Based on a forum post on a similar-ish issue I've done an ls on /usr/local/lib directory and found:
libpng15.a libpng15.so.15 libpng.la libpng15.la
libpng15.so.15.7.0 libpng.so libpng15.so libpng.a
though I don't know if that's actually any use in diagnosing/ruling out certain problems. Can anyone advise what might be wrong, keeping in my my minimal experience with compiling code on Linux?
Edit:
As requested, here is a sample of the trace beginning at the make call:
bryce@whatever:~/Downloads/pngnq-1.1$ make
Making all in src
make[1]: Entering directory `/home/bryce/Downloads/pngnq-1.1/src'
make all-am
make[2]: Entering directory `/home/bryce/Downloads/pngnq-1.1/src'
gcc `libpng-config --I_opts` -Wall --pedantic -std=gnu99 -g -O2 `libpng-config
--ldflags` -lz -o pngnq pngnq.o neuquant32.o rwpng.o -lm -lz
pngnq.o: In function `pngnq':
/home/bryce/Downloads/pngnq-1.1/src/pngnq.c:518: undefined reference to `png_get_gAMA'
Sounds like includes don't match the library. Double check to see if you've got png.h in /usr/include or libpng* in /usr/lib/.
Also show the gcc line that shows up before you see the error. That might point to the issue.