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-rw-r--r--pkgs/development/libraries/mpfr/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/libraries/mpfr/default.nix b/pkgs/development/libraries/mpfr/default.nix
index e1809d544d1f..581f956b0afd 100644
--- a/pkgs/development/libraries/mpfr/default.nix
+++ b/pkgs/development/libraries/mpfr/default.nix
@@ -14,6 +14,7 @@ stdenv.mkDerivation rec {
   propagatedBuildInputs = [ gmp ];
 
   configureFlags =
+    stdenv.lib.optional stdenv.isSunOS "--disable-thread-safe" ++
     stdenv.lib.optional stdenv.is64bit "--with-pic";
 
   doCheck = true;