diff --git a/pkgs/applications/science/math/csdp/default.nix b/pkgs/applications/science/math/csdp/default.nix
index 7aafe9da41e4..796e8b7264fb 100644
--- a/pkgs/applications/science/math/csdp/default.nix
+++ b/pkgs/applications/science/math/csdp/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
     sha256 = "1f9ql6cjy2gwiyc51ylfan24v1ca9sjajxkbhszlds1lqmma8n05";
   };
 
-  buildInputs = [ blas gfortran liblapack ];
+  buildInputs = [ blas gfortran.cc.lib liblapack ];
 
   postPatch = ''
     substituteInPlace Makefile --replace /usr/local/bin $out/bin
diff --git a/pkgs/development/libraries/science/math/blas/default.nix b/pkgs/development/libraries/science/math/blas/default.nix
index ce35743e8bc6..6f729e8a0b2a 100644
--- a/pkgs/development/libraries/science/math/blas/default.nix
+++ b/pkgs/development/libraries/science/math/blas/default.nix
@@ -46,6 +46,13 @@ stdenv.mkDerivation rec {
     ln -s libblas.so.${version} "$out/lib/libblas.so"
   '';
 
+  preFixup = stdenv.lib.optionalString stdenv.isDarwin ''
+    for fn in $(find $out/lib -name "*.so*"); do
+      if [ -L "$fn" ]; then continue; fi
+      install_name_tool -id "$fn" "$fn"
+    done
+  '';
+
   meta = {
     description = "Basic Linear Algebra Subprograms";
     license = stdenv.lib.licenses.publicDomain;