--- a/tllocalmgr	2022-04-30 12:51:53.267184213 +0200
+++ b/tllocalmgr	2022-04-30 12:54:50.636930181 +0200
@@ -639,6 +639,9 @@
 		open PKGBUILD, "> $ROOT/builds/$pkg/PKGBUILD";
         my $newver = $tlpkg->revision;
 		my $col = $collectionsbypkg{$pkg};
+		my $conflict = (defined $col and $col ne '')
+                       ? "conflicts=('texlive-$col>=$YEAR.$newver')"
+                       : "conflicts=()";
 		my $pkgsha512 = $tlpkg->containerchecksum;
 		#TODO download it first and compare the checksum
 		#     if it differs ask the user if the PKGBUILD
@@ -653,7 +656,7 @@
 arch=('any')
 groups=('texlive-local')
 depends=('texlive-core')
-conflicts=('texlive-$col>=$YEAR.$newver')
+$conflict
 url='http://tug.org/texlive/'
 source=('$TLARCHIVE/$pkg.tar.xz')
 sha512sums=($pkgsha512)