Как ребилдить пакеты, подобные fpc, в CentOS/Fedora ?

Name: fpc
Epoch: 2
Version: 2.6.0
Release: alt2.qa2

Summary: Free Pascal Compiler -- Meta Package
License: GPL
Group: Development/Other
Packager: Slava Dubrovskiy <dubrsl@altlinux.ru>

Url: http://www.freepascal.org
Source: fpcbuild-%version.tar
Source1: fp.desktop
Source2: fp.sh
Source3: fp.cfg
Source4: fp16x16.xpm
Source5: fp48x48.xpm
Source6: ppc386_bootstrap
Source7: ppcx64_bootstrap

Patch: %name-%version-alt-changes.patch

%define makedoc 0
%define makesrc 1
%define maketests 1
%define makewin32 1

ExclusiveOS: Linux
ExclusiveArch: %ix86 amd64 x86_64
Requires: fpc-units-rtl fpc-compiler fpc-units-base fpc-ide fpc-units-fcl fpc-units-fv fpc-units-gtk fpc-units-gtk2 fpc-units-gnome1 fpc-units-db fpc-units-gfx fpc-units-net fpc-units-math fpc-units-misc fpc-units-multimedia

# Automatically added by buildreq on Thu Oct 01 2009
BuildRequires: fpc-compiler fpc-utils libexpat-devel libgdb-devel libncurses-devel libreadline-devel-static rpm-build-fpc python-devel zlib-devel
%if %makedoc
BuildRequires: tex4ht texlive-generic-recommended texlive-latex-recommended fpc-units-fcl
%endif

%ifarch %ix86
%define ppctarget i386-linux
%else
%define ppctarget x86_64-linux
%define makewin32 0
%endif
%define ppcname %(basename `fpc -PB`)

%description
The Free Pascal Compiler is an object pascal compiler supporting both Delphi
and Turbo Pascal 7.0 dialects as well as Mac pascal dialects.
It provides a completely portable RunTime Library (RTL) available on many
platforms and compatible with Turbo Pascal, but also a platfrom independent
class based Free Component Library (FCL) adding many Delphi extensions and
interfacing many popular open source libraries.

Some extensions are added to the language, like function overloading. Shared
libraries can be linked and created. Delphi language extentions like classes,
exceptions, ansi strings and open arrays are also supported.

This package contains dependency on all FPC packages provided on your
architecture. Experienced users may want to install only packages they need,
and can skip installing this metapackage.

%prep
%setup -q -n fpcbuild-%version
%patch -p1

sed -i "s|/usr/local/lib|%_libdir|g" fpcsrc/packages/gdbint/src/gdbint.pp
sed -i "/LINKLIB/s/python/python2.7/" fpcsrc/packages/gdbint/src/gdbint.pp
sed -i "/LINKLIB ncurses/a {\$LINKLIB z}" fpcsrc/packages/gdbint/src/gdbint.pp

sed -i '/fp/s/\/bin/\/usr\/bin/g' fpcsrc/compiler/utils/samplecfg

%build
# install src
rm -rf ../fpcsrc
mkdir -p ../fpcsrc
cp -fR  fpcsrc/* ../fpcsrc/
rm -rf ../fpcsrc/{ide,installer,tests,utils}

export OPT="-vwn "
export GDBLIBDIR=%_libdir
export LIBGDBFILE=%_libdir/libgdb.a

# bootstrap fpc
%ifarch %ix86
cp %SOURCE6 .
make -C fpcsrc/compiler cycle RELEASE=1 FPC=$PWD/ppc386_bootstrap
%else
cp %SOURCE7 .
make -C fpcsrc/compiler cycle RELEASE=1 FPC=$PWD/ppcx64_bootstrap
%endif
cp -pv fpcsrc/compiler/%ppcname %ppcname

# bootstrap fpcmake
%fpc_build FPC=$PWD/%ppcname FPCDIR=$PWD -C fpcsrc/rtl
%fpc_build FPC=$PWD/%ppcname FPCDIR=$PWD -C fpcsrc/compiler
%fpc_build FPC=$PWD/%ppcname FPCDIR=$PWD -C fpcsrc/packages fcl_smart
%fpc_build FPC=$PWD/%ppcname FPCDIR=$PWD -C fpcsrc/utils
cp -pv fpcsrc/utils/fpcm/fpcmake fpcmake