[libGD] #225 [Task opened] configure.ac should be using pkg-config to check for libpng

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User who did this - Samuli Suominen (ssuominen) 

Attached to Project - libGD
Summary - configure.ac should be using pkg-config to check for libpng
Task Type - Bug Report
Category - General
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Normal
Reported Version - 2.0.35
Due in Version - Undecided
Due Date - Undecided
Details - configure.ac should be using pkg-config to check for libpng, because with libpng 1.4.2 you get libpng14-config and libpng14.so instead of libpng12-config and libpng12.so.

and then when libpng 1.6 will be released in a future, it will break again.

it would be best to switch to using pkg-config to check for libpng presence now, to fix the issues now and for the future.

consider this,

Install libpng-1.2.43, have libpng12-config (this is installed for backward's compability for certain non-libgd related issues)
install libpng-1.4.2, have libpng14-config, and libpng-config --libs that will return -lpng14

then ./configure, and it will find libpng12-config and prefer it over the newer libpng14-config and libpng-config. 

you end up with libgd linked against old libpng, or not linked to libpng at all.

i'd guess using libpng.pc (the generic pkg-config file name) would be the best here.

More information can be found at the following URL:
http://bugs.libgd.org/?do=details&task_id=225

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