diff --git a/extra/math/blas/config/config.factor b/extra/math/blas/config/config.factor
index 4c9f785284..35ac310bc3 100644
--- a/extra/math/blas/config/config.factor
+++ b/extra/math/blas/config/config.factor
@@ -1,4 +1,5 @@
-USING: alien.fortran combinators kernel namespaces system ;
+USING: alien.fortran combinators kernel math namespaces
+sequences system system-info ;
 IN: math.blas.config
 
 SYMBOLS: blas-library blas-fortran-abi deploy-blas? ;
@@ -13,7 +14,17 @@ blas-library [
 
 blas-fortran-abi [
     {
-        { [ os macosx?                  ] [ intel-unix-abi ] }
+        { [ os macosx? cpu x86.32? and ] [ intel-unix-abi ] }
+        { [ os macosx? cpu x86.64? and ]
+            [
+                os-version second {
+                    { [ dup 7 >= ] [ f2c-abi ] }
+                    { [ dup 6 = ] [ "The libblas.dylib included in Mac OS X 10.6 is incompatible with Factor. To use the math.blas bindings y
+ou will need to install a third-party BLAS library and configure Factor. See `\"math.blas.config\" about` for more information." <bad-fortran-abi> ] }
+                    [ intel-unix-abi ]
+                } cond nip
+            ]
+        }
         { [ os windows? cpu x86.32? and ] [ f2c-abi        ] }
         { [ os windows? cpu x86.64? and ] [ gfortran-abi   ] }
         ! { [ os freebsd?                 ] [ gfortran-abi   ] }