# libmodpng14/cfg - "Build" settings for package

#---------------------------------------------------------------------

[technotes]

1. "libmodpng14" provides  functionality  similar to that of  "libpng"
1.4, but doesn't conflict with "libpng" 1.6.

Other packages, with changes as discussed below, can use "libmodpng14"
instead of "libpng" 1.4.  This makes it  simpler to build them against
other libraries that  happen to  use  post-1.4 releases  of  "libpng";
i.e., conflicts are less likely.

----------------------------------------------------------------------

2. For another package, say, Salad, to use "libmodpng14", changes need
to be made to Salad's source code.  However, the "libmodpng14" changes
may  be  simpler  than those  needed to  upgrade Salad to "libpng" 1.6
compatibility.

In fact,  the following single  "sed" command  may be enough,  in some
cases, to change an "autoconf"-based package that uses "libpng" 1.4 so
as to make it use "libmodpng14" instead:

sed -e 's/png_/modpng14_/g' \
    -e 's/libpng/libmodpng14/g' \
    -e 's/-lpng/-lmodpng14/g' \
    -e 's/PNGAPI/MODPNG14API/g' \
    -e 's/PNG_/MODPNG14_/g' \
    -e 's/png.h/modpng14.h/g' \
    -e 's/pngconf.h/modpng14conf.h/g' \
    -i `ff -at`

This command should be executed in the  top-level  source directory of
the package that needs to be modified.

Packages  that use "cmake", "scons", or other build systems will prob-
ably require additional work.

----------------------------------------------------------------------

3. "libmodpng14"  provides  its own versions of the following "libpng"
legacy functions that were dropped in "libpng" 1.4:

    png_check_sig
    png_read_data
    png_set_dither
    png_set_gray_1_2_4_to_8

This package's versions have names that start with "png14_" instead of
"png_".

#---------------------------------------------------------------------

[buildtimes]

00.00 hours (or 000.23 minutes) - HP EliteBook 8560w 32GB RAM
00.00 hours (or 000.28 minutes) - Dell Inspiron 6400 2.0 GHz Intel Duo
                                  7200 2GB RAM
00.01 hours (or 000.30 minutes) - ThinkPad E540 i7 4x2 16GB RAM
00.02 hours (or 001.45 minutes) - Compaq 1.7 GHz Intel Pentium 4 512MB
                                  RAM

#---------------------------------------------------------------------

[settings]
build      = default
dontfind   = libpng12, libpng14
license    = See "license.txt" under installed tree
nosyslinks = yes
setpaths   = libmodpng14
tmpsize    = 6M
unpack     = relaxed

#---------------------------------------------------------------------

[depends]
actools
gawk
grep
sed
zlib

#---------------------------------------------------------------------

[configure]
MANBASE=$PKGDIR_PROD/man
mkdir -p $MANBASE

bash ./configure \
    --prefix=$PKGDIR_PROD          \
    --build=$LACARCHBUILD          \
    --host=$LACARCHHOST            \
    --disable-dependency-tracking  \
    --enable-shared=yes            \
    --enable-static=yes            \
    --mandir=$MANBASE

#---------------------------------------------------------------------

[postbuild]
BINDIR=$PKGDIR_PROD/bin
LIBDIR=$PKGDIR_PROD/lib
PCFDIR=$LIBDIR/pkgconfig

mkdir -p $BINDIR $PCFDIR

rm -fr $BINDIR/*
cp -p libmodpng14-config $BINDIR/
rm -fr $PCFDIR/*
cp -p libmodpng14.pc     $PCFDIR/

#---------------------------------------------------------------------

# Original URLs. These URLs were valid at one point, but may have died
# since then. If you download newer versions of tarballs [etc.], don't
# delete  the  original versions,  as you may not  be able  to replace
# them.

[urls]
url_debian  = http://packages.debian.org/unstable/source/libmodpng1414
url_home    = http://www.libmodpng1414.org/pub/png/libmodpng1414.html

url_lfs     = http://www.linuxfromscratch.org/blfs/view/stable/\
general/libmodpng14.html

url_tarball = Created locally

#---------------------------------------------------------------------

[history]
170706 Added package. Started with 170706.