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-rw-r--r--pkgs/development/libraries/science/math/arpack/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/science/math/arpack/default.nix b/pkgs/development/libraries/science/math/arpack/default.nix
index a5fbb679df5..0829557d0f3 100644
--- a/pkgs/development/libraries/science/math/arpack/default.nix
+++ b/pkgs/development/libraries/science/math/arpack/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation {
 
   cmakeFlags = [
     "-DBUILD_SHARED_LIBS=ON"
-    "-DINTERFACE64=${optionalString blas.is64bit "1"}"
+    "-DINTERFACE64=${optionalString blas.isILP64 "1"}"
   ];
 
   preCheck = if stdenv.isDarwin then ''