Per convention, the file should be named {package name}.spec.
cp $PROJECT-$VERSION.tar.gz $TMPDIR/SOURCES/$PROJECT-$VERSION.tar.gz
cat pkgscripts/rpm.spec | sed s/%{_blddir}/%{_tmppath}/g \
- | sed s/#--\>//g > $TMPDIR/SPECS/rpm.spec
+ | sed s/#--\>//g > $TMPDIR/SPECS/$PKGNAME.spec
-rpmbuild -bs --define "_topdir $TMPDIR" $TMPDIR/SPECS/rpm.spec
+rpmbuild -bs --define "_topdir $TMPDIR" $TMPDIR/SPECS/$PKGNAME.spec
mv $TMPDIR/SRPMS/$PKGNAME-$VERSION-$BUILD.src.rpm $PKGNAME-$VERSION.src.rpm
exit