Sudden dependency on rpm

[Tim T.]

"Suddenly" my rpms show a dependency on /bin/sh where they didn't before !

Last friday, I build a package TimT-5.0.1.d-0.x86_64.rpm

rpm -qip --requires TimT-5.0.1.d-0.x86_64.rpm
Name        : TimT                   Relocations: (not relocatable)
Version     : 5.0.1.d                           Vendor: Tim T.
Release     : 0                             Build Date: Fri 23 Sep 2011
10:39:29 AM MEST
Install Date: (not installed)               Build Host: buildhost
Group       : System                        Source RPM :
TimT-5.0.1.d-0.src.rpm
Size        : 35881                            License: commercial
Signature   : (none)
Summary     : installation software
Description :
TimT - installation software
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1


This morning I rebuilt the package :
rpm -qip --requires TimT-5.0.1.a-0.x86_64.rpm
Name        : TimT                   Relocations: (not relocatable)
Version     : 5.0.1.a                           Vendor: TimT
Release     : 0                             Build Date: Tue 27 Sep 2011
12:25:26 PM MEST
Install Date: (not installed)               Build Host: buildhost
Group       : System                        Source RPM:
TimT-5.0.1.a-0.src.rpm
Size        : 35881                            License:commercial
Signature   : (none)
Summary     : installation software
Description :
TimT - installation software
/bin/sh
/usr/bin/ksh
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1

(for legal reasons, I changed the name of the package in the above output. )

The only deliberate change in the above is the version number from 5.0.1.d
to 5.0.1.a

My systems people swear that they did not change anything, installation
history on the buildhost confirms this

Source files haven't changed, they are simple shell-scripts and they do use
the /bin/sh, and /usr/bin/ksh

rpms are generated using

/usr/bin/rpmbuild -bb --quiet --buildroot /tmp/buildroot timt.spec

spec file hasn't changed.

Any suggestions as to where to look ? I'm stumped.

Tim T.
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