Does not build with alternate prefix

[dsem]

Setting the prefix to /opt

%define __prefix /opt

causes the packaging to fail,

+ '[' '!' -z 2.7 ']'
+ cd /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/opt/bin
+ mv pydoc pydoc.old
+ sed 's|#!.*|#!/opt/bin/python2.7|' pydoc.old
+ chmod 755 pydoc
+ rm -f pydoc.old
+ sed -i -e 's|#!.*|#!/opt/bin/python2.7|' python2.7-config
+ '[' '!' -z 2.7 ']'
+ cd /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/opt/bin
+ for file in 2to3 pydoc python-config idle smtpd.py
+ '[' -f 2to3 ']'
+ mv 2to3 2to32.7
+ for file in 2to3 pydoc python-config idle smtpd.py
+ '[' -f pydoc ']'
+ mv pydoc pydoc2.7
+ for file in 2to3 pydoc python-config idle smtpd.py
+ '[' -f python-config ']'
+ for file in 2to3 pydoc python-config idle smtpd.py
+ '[' -f idle ']'
+ mv idle idle2.7
+ for file in 2to3 pydoc python-config idle smtpd.py
+ '[' -f smtpd.py ']'
+ mv smtpd.py smtpd.py2.7
+ chmod 644 /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/opt/lib/libpython2.7.a
+ cp -a Tools /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/opt/lib/python2.7
+ rm -f mainpkg.files
+ sed 's|^/home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64|/|'
+ grep -v -e '_tkinter.so$'
+ find /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/opt/lib/python2.7 -type f
+ grep -v -e '/bin/2to32.7$'
+ grep -v -e '/bin/pydoc2.7$'
+ grep -v -e '/bin/smtpd.py2.7$'
+ find /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/opt/bin -type f -o -type l
+ grep -v -e '/bin/idle2.7$'
+ sed 's|^/home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64|/|'
+ echo /opt/include/python2.7/pyconfig.h
+ rm -f tools.files
+ echo /opt/lib/python2.7/Tools
+ echo /opt/lib/python2.7/lib2to3/tests
+ echo /opt/bin/2to32.7
+ echo /opt/bin/pydoc2.7
+ echo /opt/bin/smtpd.py2.7
+ echo /opt/bin/idle2.7
+ mkdir -p /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/var/www/html/python2.7.10
+ cd /home/dylan/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/var/www/html/python2.7.10
+ tar x
+ bunzip2
/var/tmp/rpm-tmp.Cc1sus: line 95: /home/dylan/rpmbuild/SOURCES/python-2.7.10-docs-html.tar.bz2: No such file or directory
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
error: Bad exit status from /var/tmp/rpm-tmp.Cc1sus (%install)

RPM build errors:
    bogus date in %changelog: Fri Jun 28 2012 Nathan Milford <nathan@milford.io> [2.7.5-1]
    bogus date in %changelog: Tue Nov 18 2001 Sean Reifschneider <jafo-rpms@tummy.com>
    bogus date in %changelog: Mon Oct  9 2001 Sean Reifschneider <jafo-rpms@tummy.com>
    Bad exit status from /var/tmp/rpm-tmp.Cc1sus (%install)

It fails whether %define config_include_docs is yes or no.

[isavcic]

Same:

RPM build errors:
    File not found: /root/rpmbuild/BUILDROOT/python27-2.7.10-1.x86_64/usr/local/share/man/man1/python2.7.1.gz

__prefix set to /usr/local/, building in centos:6 Docker image. Note that unchanged spec (__prefix set to /usr) works as intended.