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-rw-r--r--tools/bwa-index.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/bwa-index.nix b/tools/bwa-index.nix
index 8ca0eec..b5e3779 100644
--- a/tools/bwa-index.nix
+++ b/tools/bwa-index.nix
@@ -15,5 +15,6 @@ stdenv.mkDerivation {
bwa index ref.fa
mkdir $out
mv ref.fa.* $out
+ grep '^>[^ \t]*_alt$' ref.fa | tr -d '^>' > $out/idxbase.alt || true
'';
}