use Perl

# cd /tmp/
# gunzip < /tmp/foo.tar.gz | tar xf -

Launch the auto-configuration:

# cd foo
# ./configure -prefix=`pwd`/../dummy_installdir --bla --bla

Launch the compilation and installation:

# make && make install

Package foo will be compiled and installed into the /tmp/dummy_installdir. Create the pkginfo file, containing the package information:

# cd /tmp/dummy_installdir
# cat > pkginfo <<EOF
CLASSES=none
BASEDIR=/usr/local/foo
TZ=GMT
PATH=/sbin:/usr/sbin:/usr/b in:/usr/sadm/install/bin
PKG=foo
NAME=foo
VERSION=42
CATEGORY=application
D ESC=Application that doesn't do a damn thing
VENDOR=Foo Inc.
EMAIL=
PKGSAV=/var/sadm/pkg/freetds/save
EOF

Create the prototype file, containing the package directory and file structure and attributes:

# find . -print | pkgproto > prototype

Update the prototype file. Remove the following lines:

f none prototype 0644 root other
f none pkginfo 0644 root other

Add the following line at the top:

i pkginfo=./pkginfo

In /tmp/dummy_installdir execute pkgmk:

# pkgmk -r `pwd`

In /var/spool/pkg a directory called foo is created. Create the actual package:

# cd /var/spool/pkg
# pkgtrans -s `pwd` /tmp/foo.pkg

When asked which tool to package, select the foo package. Compress the package:

# cd /tmp
# gzip /tmp/ foo.pkg

The end result is a file called foo.pkg.gz