diff --git a/Compiler/atlas/build b/Compiler/atlas/build
index 43dc1a2..48318b9 100755
--- a/Compiler/atlas/build
+++ b/Compiler/atlas/build
@@ -1,5 +1,7 @@
 #!/usr/bin/env modbuild
 
+SOURCE_URL="https://sourceforge.net/projects/math-atlas/files/Stable/$V/atlas$V.tar.bz2"
+
 pbuild::configure() {
 	"${MODULE_SRCDIR}"/configure \
 		--prefix="${PREFIX}" \