Problems with ESP Ghostscript 7.07.1 and a system libpng

[lizardo@…]

From ​http://archives.linuxfromscratch.org/mail-archives/blfs-dev/2004-February/005199.html:

The current stable espgs version (7.07.1) has a bug which prevents a system libpng from being detected, so to build a gs binary with PNG support, we have necessarily to unpack the lipng package inside the espgs source dir.

The patch ​http://www.linuxfromscratch.org/patches/downloads/espgs/espgs-7.07.1-libpng_check.patch, backported from CVS, fixes this issue. Unfortunately, this fix exposed another bug when compiling the shared library (see ​http://www.cups.org/str.php?L602 for details). For this specific bug, we don't need a patch, only a instruction modification.

Finally, the following changes are suggested to resolve this issue:

• Add the espgs-7.07.1-libpng_check.patch to the ESP Ghostscript section marked as "required".
• Change the the shared library compilation instruction to:

make CFLAGS_SO='-fPIC $(ACDEFS)' so

The upcoming 7.07.2 version is supposed to fix these bugs.

[tushar@…]

The bug is with libpng. libpng.so should link against libz.so and libm.so.

The patch mentioned in the espgs bugzilla works perfectly. Can you submit that to the patches project?

[lizardo@…]

The bug is with libpng. libpng.so should link against libz.so and libm.so.

Yep, I know. But the espgs developers opted for not depending on libpng being linked against libz, so decided to explictly add "-lz" to the libpng check. I just picked the fix from the CVS (which soo will become 7.07.2). See the resolution of this bug:

​http://www.cups.org/str.php?L396

The patch mentioned in the espgs bugzilla works perfectly. Can you submit that to the patches project?

Certainly. But the modified instruction I suggested above has the same effect, and avoids an additional third patch. As soon as 7.07.2 is released, both patches (libpngcheck and libpngsupport) will not be needed anymore.

[bdubbs@…]

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