diff --git a/conf/templates/packaging/scripts/logilab-astng-install.sh b/conf/templates/packaging/scripts/logilab-astng-install.sh
index fb115665..a4b3c673 100644
--- a/conf/templates/packaging/scripts/logilab-astng-install.sh
+++ b/conf/templates/packaging/scripts/logilab-astng-install.sh
@@ -1,4 +1,4 @@
-python setup.py install --single-version-externally-managed -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
+%{__python} setup.py install --single-version-externally-managed -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
 abspath_installed_files=$(readlink -f INSTALLED_FILES)
 (
     cd $RPM_BUILD_ROOT
diff --git a/conf/templates/packaging/scripts/networkx-install.sh b/conf/templates/packaging/scripts/networkx-install.sh
index 15aa919c..20f13acc 100644
--- a/conf/templates/packaging/scripts/networkx-install.sh
+++ b/conf/templates/packaging/scripts/networkx-install.sh
@@ -1,4 +1,4 @@
-python setup.py install -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
+%{__python} setup.py install -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
 
 abspath_installed_files=$(readlink -f INSTALLED_FILES)
 (
diff --git a/conf/templates/packaging/scripts/selenium-install.sh b/conf/templates/packaging/scripts/selenium-install.sh
index 23ce68f3..f00b677c 100644
--- a/conf/templates/packaging/scripts/selenium-install.sh
+++ b/conf/templates/packaging/scripts/selenium-install.sh
@@ -1,4 +1,4 @@
-python setup.py install -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
+%{__python} setup.py install -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
 
 # remove driver parts for other architectures
 %ifnarch %ix86
diff --git a/conf/templates/packaging/specs/openstack-keystone.spec b/conf/templates/packaging/specs/openstack-keystone.spec
index 9f93902f..d47a9eeb 100644
--- a/conf/templates/packaging/specs/openstack-keystone.spec
+++ b/conf/templates/packaging/specs/openstack-keystone.spec
@@ -114,7 +114,7 @@ This package contains the Keystone Python library.
 #raw
 
 %build
-python setup.py build
+%{__python} setup.py build
 
 
 %install
@@ -131,7 +131,7 @@ popd
 rm -fr doc/build/html/.doctrees doc/build/html/.buildinfo
 %endif
 
-python setup.py install --prefix=%{_prefix} --root=%{buildroot}
+%{__python} setup.py install --prefix=%{_prefix} --root=%{buildroot}
 
 
 %if ! 0%{?usr_only}
diff --git a/conf/templates/packaging/specs/openstack-trove.spec b/conf/templates/packaging/specs/openstack-trove.spec
index 273bb623..695050b2 100644
--- a/conf/templates/packaging/specs/openstack-trove.spec
+++ b/conf/templates/packaging/specs/openstack-trove.spec
@@ -118,7 +118,7 @@ simple runner (%{python_name}-make-test-env).
 #raw
 
 %build
-python setup.py build
+%{__python} setup.py build
 
 
 %install
@@ -135,7 +135,7 @@ popd
 rm -fr doc/build/html/.doctrees doc/build/html/.buildinfo
 %endif
 
-python setup.py install --prefix=%{_prefix} --root=%{buildroot}
+%{__python} setup.py install --prefix=%{_prefix} --root=%{buildroot}
 
 %if ! 0%{?usr_only}
 
diff --git a/tools/py2rpm b/tools/py2rpm
index d16234a6..14832b4c 100755
--- a/tools/py2rpm
+++ b/tools/py2rpm
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 import argparse
 import distutils.spawn
@@ -32,9 +32,9 @@ DEFAULT_SCRIPTS = {
     "prep":
     """%setup -n %{pkg_name}-%{unmangled_version} -n %{pkg_name}-%{unmangled_version}""",
     "build":
-    """python setup.py build""",
+    """%{__python} setup.py build""",
     "install":
-    """python setup.py install -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
+    """%{__python} setup.py install -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
 abspath_installed_files=$(readlink -f INSTALLED_FILES)
 (
     cd $RPM_BUILD_ROOT