CWD=`pwd`
TMP=/tmp
PKG=$TMP/package-libpng
rm -rf $PKG
mkdir -p $PKG/usr

VERSION=1.2.50
ARCH=${ARCH:-i486}
BUILD=1_slack12.1

cd $TMP
rm -rf libpng-$VERSION
tar xjvf $CWD/libpng-$VERSION.tar.bz2 || exit 1
cd libpng-$VERSION
chown -R root:root .
find . -perm 664 -exec chmod 644 {} \;
find . -perm 600 -exec chmod 644 {} \;
find . -perm 444 -exec chmod 644 {} \;
find . -perm 400 -exec chmod 644 {} \;
find . -perm 440 -exec chmod 644 {} \;
find . -perm 777 -exec chmod 755 {} \;
find . -perm 775 -exec chmod 755 {} \;
find . -perm 511 -exec chmod 755 {} \;
find . -perm 711 -exec chmod 755 {} \;
find . -perm 555 -exec chmod 755 {} \;

# Might as well link to -lz -lm, since the ./configure seems
# to be doing it that way now...  finally.  That'll prevent
# a couple of emails a week.  :-)
zcat $CWD/libpng.libs.diff.gz | patch -p1 --verbose || exit 1

# Need this to substitute macros, but we'll keep using the
# pre-built Makefile for now anyway...
./configure --prefix=/usr

# Link the custom makefile:
ln -sf scripts/makefile.linux ./Makefile

make -j4 prefix=/usr || exit 1
make install prefix=/usr DESTDIR=$PKG

# This symlink is needed to keep old applications running:
# I guess the real lib used the major number 3, then 0 for
# a short while, and now .3 again.  Hopefully it will stay
# this way as it was .3 in Slackware 10.2.  One can hope.
( cd $PKG/usr/lib
  if [ ! -e libpng.so.0 -a -e libpng.so.3 ]; then
    ln -sf libpng.so.3 libpng.so.0
  fi
)

( cd $PKG
  find . | xargs file | grep "executable" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
  find . | xargs file | grep "shared object" | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null
)
gzip -9 $PKG/usr/man/man?/*
mkdir -p $PKG/usr/doc/libpng-$VERSION
cp -a \
  ANNOUNCE CHANGES INSTALL KNOWNBUG LICENSE README TODO Y2KINFO libpng.txt example.c \
  $PKG/usr/doc/libpng-$VERSION
mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
makepkg -l y -c n ../libpng-$VERSION-$ARCH-$BUILD.tgz