diff --git a/sysa/autoconf-2.12/checksums b/sysa/autoconf-2.12/checksums
deleted file mode 100644
index e69de29..0000000
diff --git a/sysa/autoconf-2.13/checksums b/sysa/autoconf-2.13/checksums
deleted file mode 100644
index e69de29..0000000
diff --git a/sysa/autoconf-2.52/checksums b/sysa/autoconf-2.52/checksums
deleted file mode 100644
index e69de29..0000000
diff --git a/sysa/automake-1.4-p6/checksums b/sysa/automake-1.4-p6/checksums
deleted file mode 100644
index e69de29..0000000
diff --git a/sysa/helpers.sh b/sysa/helpers.sh
index 74b25a4..30a260b 100755
--- a/sysa/helpers.sh
+++ b/sysa/helpers.sh
@@ -57,7 +57,7 @@ build () {
     cd ../..
 
     echo "${pkg}: checksumming installed files."
-    sha256sum -c "${checksum_f}"
+    test -e "${checksum_f}" && sha256sum -c "${checksum_f}"
 
     echo "${pkg}: build successful"
     cd ..