[CentOS] rpmbuild failure

 I'm trying to rebuild nx-3.2.0-8.el5.centos.src.rpm from the extras repo.
 It works on a machine running 5.1, but fails on another running 5.3. The
 working machine is arch=x86_64, the other i386. The strange bit is the line
 rpmbuild complains about: it's the last line in the spec file, at the end
 of the %changelog section:

[...]
Processing files: nx-debuginfo-3.2.0-8
Finding  Provides: /usr/src/redhat/SOURCES/nxfind-provides.sh
error: line 352: Dependency tokens must begin with alpha-numeric, '_' or '/': - Updated SuSE package to work with Fedora

error: Failed to find Provides:
Requires(rpmlib): rpmlib(PayloadFilesHavePrefix) <= 4.0-1 rpmlib(CompressedFileNames) <= 3.0.4-1
Checking for unpackaged file(s): /usr/lib/rpm/check-files /var/tmp/nx-3.2.0-8-root-root


RPM build errors:
    line 352: Dependency tokens must begin with alpha-numeric, '_' or '/': - Updated SuSE package to work with Fedora

    Failed to find Provides:
#