The RPM BUILD TREE is on /local/002_rpmbuild/rpmbuild/SOURCES, SPECS, .....
The process is run under normal user ( not root ) from a script named rpmbuild_project_mysql.

Here somme screen logs :
user@asus:~> rpmbuild_project_mysql
MAIN - 2 parametres
MAIN - PARAM0 : /home/user/bin/rpmbuild_project
MAIN - PARAM1 : mysql-5.6.14.tar.gz
MAIN - PARAM2 : .tar.gz
CMD : cd /local/002_rpmbuild/rpmbuild/SOURCES
CMD : tar -vzxf ./mysql-5.6.14.tar.gz > /tmp/000_rpmbuild_mysql_untar.txt
tar: mysql-5.6.14/Docs: Cannot utime: Operation not permitted
tar: mysql-5.6.14/Docs: Cannot change mode to rwxr-xr-x: Operation not permitted
tar: mysql-5.6.14/packaging/rpm-uln: Cannot utime: Operation not permitted
tar: mysql-5.6.14/packaging/rpm-uln: Cannot change mode to rwxr-xr-x: Operation not permitted
tar: mysql-5.6.14/packaging/solaris: Cannot utime: Operation not permitted
tar: mysql-5.6.14/packaging/solaris: Cannot change mode to rwxr-xr-x: Operation not permitted
tar: mysql-5.6.14/packaging/WiX/ca: Cannot utime: Operation not permitted
tar: mysql-5.6.14/packaging/WiX/ca: Cannot change mode to rwxr-xr-x: Operation not permitted
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tar: mysql-5.6.14/mysql-test/lib/My: Cannot utime: Operation not permitted
tar: mysql-5.6.14/mysql-test/lib/My: Cannot change mode to rwxr-xr-x: Operation not permitted
tar: mysql-5.6.14/mysql-test/lib: Cannot utime: Operation not permitted
tar: mysql-5.6.14/mysql-test/lib: Cannot change mode to rwxr-xr-x: Operation not permitted
tar: mysql-5.6.14/mysql-test: Cannot utime: Operation not permitted
tar: mysql-5.6.14/mysql-test: Cannot change mode to rwxr-xr-x: Operation not permitted
tar: mysql-5.6.14: Cannot utime: Operation not permitted
tar: mysql-5.6.14: Cannot change mode to rwxr-xr-x: Operation not permitted
tar: Exiting with failure status due to previous errors
SOURCE_NAME : mysql-5.6.14
EXT_NAME : .tar.gz
CMD : cd /local/002_rpmbuild/rpmbuild/SOURCES/mysql-5.6.14/support-files
CMD : cp -v mysql-5.6.14.spec /local/002_rpmbuild/rpmbuild/SPECS
‘mysql-5.6./m.14.spec’ -> ‘/local/002_rpmbuild/rpmbuild/SPECS/mysql-5.6.14.spec’
CMD : cd /local/002_rpmbuild/rpmbuild/SPECS/
CMD : rpmbuild -vv -bb --clean mysql-5.6.14.spec
error: line 246: Tag takes single token only: Release: 1.linux_glibcse version 2.17 (git c758a6861537)

Here is line 256 of mysql-5.6.14.spec :

Release: %{release}%{?distro_releasetag:.%{distro_releasetag}}


and here line 33 of mysql-5.6.14.spec

%global release 1

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by the way the file mysql-5.6.14/support-files/mysql.5.6.14.spec should be named
mysql-5.6.14.spec

Any help is welcome.

Thank you for helping