diff --git a/pkgs/development/compilers/gcc/ng/common/default.nix b/pkgs/development/compilers/gcc/ng/common/default.nix
index 7c9395528e4f..2a129f909ad7 100644
--- a/pkgs/development/compilers/gcc/ng/common/default.nix
+++ b/pkgs/development/compilers/gcc/ng/common/default.nix
@@ -187,6 +187,9 @@ makeScopeWithSplicing' {
           ++ [
             "-B${targetGccPackages.libstdcxx}/lib"
             "-B${targetGccPackages.libgfortran}/lib/"
+            # `libgfortran.spec`, which the driver reads from the directory
+            # above, links `-lquadmath` unconditionally.
+            "-B${targetGccPackages.libquadmath}/lib"
           ]
           ++ threadsCflags;
         };