--- a/contrib/mercurial.spec	Sun Aug 31 12:51:06 2014 +0200
+++ b/contrib/mercurial.spec	Thu May 15 01:50:11 2014 +0200
@@ -1,6 +1,23 @@
 %global emacs_lispdir %{_datadir}/emacs/site-lisp
+
+%define withpython %{nil}
+
+%if "%{?withpython}"
+
+%global pythonver %{withpython}
+%global pythonname Python-%{withpython}
+%global docutilsname docutils-0.11
+%global pythonhg python-hg
+%global hgpyprefix /usr/%{pythonhg}
+# byte compilation will fail on some some Python /test/ files
+%global _python_bytecompile_errors_terminate_build 0
+
+%else
+
 %global pythonver %(python -c 'import sys;print ".".join(map(str, sys.version_info[:2]))')
 
+%endif
+
 Summary: A fast, lightweight Source Control Management system
 Name: mercurial
 Version: snapshot
@@ -9,11 +26,19 @@
 Group: Development/Tools
 URL: http://mercurial.selenic.com/
 Source0: %{name}-%{version}-%{release}.tar.gz
+%if "%{?withpython}"
+Source1: %{pythonname}.tgz
+Source2: %{docutilsname}.tar.gz
+%endif
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
 
-BuildRequires: python >= 2.4, python-devel, make, gcc, python-docutils >= 0.5, gettext
-Provides: hg = %{version}-%{release}
+BuildRequires: make, gcc, gettext
+%if "%{?withpython}"
+BuildRequires: readline-devel, openssl-devel, ncurses-devel, zlib-devel, bzip2-devel
+%else
+BuildRequires: python >= 2.4, python-devel, python-docutils >= 0.5
 Requires: python >= 2.4
+%endif
 # The hgk extension uses the wish tcl interpreter, but we don't enforce it
 #Requires: tk
 
@@ -22,15 +47,69 @@
 for efficient handling of very large distributed projects.
 
 %prep
+
+%if "%{?withpython}"
+%setup -q -n mercurial-%{version}-%{release} -a1 -a2
+# despite the comments in cgi.py, we do this to prevent rpmdeps from picking /usr/local/bin/python up
+sed -i '1c#! /usr/bin/env python' %{pythonname}/Lib/cgi.py
+%else
 %setup -q -n mercurial-%{version}-%{release}
+%endif
 
 %build
+
+%if "%{?withpython}"
+
+PYPATH=$PWD/%{pythonname}
+cd $PYPATH
+./configure --prefix=%{hgpyprefix}
+make all %{?_smp_mflags}
+cd -
+
+cd %{docutilsname}
+LD_LIBRARY_PATH=$PYPATH $PYPATH/python setup.py build
+cd -
+
+# verify Python environment
+LD_LIBRARY_PATH=$PYPATH PYTHONPATH=$PWD/%{docutilsname} $PYPATH/python -c 'import sys, zlib, bz2, ssl, curses, readline'
+
+# set environment for make
+export PATH=$PYPATH:$PATH
+export LD_LIBRARY_PATH=$PYPATH
+export CFLAGS="-L $PYPATH"
+export PYTHONPATH=$PWD/%{docutilsname}
+
+%endif
+
 make all
 
 %install
 rm -rf $RPM_BUILD_ROOT
+
+%if "%{?withpython}"
+
+PYPATH=$PWD/%{pythonname}
+cd $PYPATH
+make install DESTDIR=$RPM_BUILD_ROOT
+# these .a are not necessary and they are readonly and strip fails - kill them!
+rm -f %{buildroot}%{hgpyprefix}/lib/{,python2.*/config}/libpython2.*.a
+cd -
+
+cd %{docutilsname}
+LD_LIBRARY_PATH=$PYPATH $PYPATH/python setup.py install --root="$RPM_BUILD_ROOT"
+cd -
+
+PATH=$PYPATH:$PATH LD_LIBRARY_PATH=$PYPATH make install DESTDIR=$RPM_BUILD_ROOT PREFIX=%{hgpyprefix} MANDIR=%{_mandir}
+mkdir -p $RPM_BUILD_ROOT%{_bindir}
+( cd $RPM_BUILD_ROOT%{_bindir}/ && ln -s ../..%{hgpyprefix}/bin/hg . )
+( cd $RPM_BUILD_ROOT%{_bindir}/ && ln -s ../..%{hgpyprefix}/bin/python2.? %{pythonhg} )
+
+%else
+
 make install DESTDIR=$RPM_BUILD_ROOT PREFIX=%{_prefix} MANDIR=%{_mandir}
 
+%endif
+
 install -m 755 contrib/hgk $RPM_BUILD_ROOT%{_bindir}/
 install -m 755 contrib/hg-ssh $RPM_BUILD_ROOT%{_bindir}/
 
@@ -71,8 +150,13 @@
 %dir %{_sysconfdir}/mercurial
 %dir %{_sysconfdir}/mercurial/hgrc.d
 %config(noreplace) %{_sysconfdir}/mercurial/hgrc.d/mergetools.rc
+%if "%{?withpython}"
+%{_bindir}/%{pythonhg}
+%{hgpyprefix}
+%else
 %if "%{?pythonver}" != "2.4"
 %{_libdir}/python%{pythonver}/site-packages/%{name}-*-py%{pythonver}.egg-info
 %endif
 %{_libdir}/python%{pythonver}/site-packages/%{name}
 %{_libdir}/python%{pythonver}/site-packages/hgext
+%endif