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-rw-r--r--pkgs/development/compilers/smlnj/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/compilers/smlnj/default.nix b/pkgs/development/compilers/smlnj/default.nix
index 75daad36f762..9b4816bb282e 100644
--- a/pkgs/development/compilers/smlnj/default.nix
+++ b/pkgs/development/compilers/smlnj/default.nix
@@ -38,7 +38,7 @@ in stdenv.mkDerivation {
   '' + stdenv.lib.optionalString stdenv.isDarwin (with darwin; ''
     sed -i '/^[[:space:]]*\*x86-darwin\*)$/,/^[[:space:]]*\*) ;;/ c\
 \  \*x86-darwin\*)\
-\    INCLFILE=${apple_sdk.sdk}/include/unistd.h\
+\    INCLFILE=${stdenv.lib.getDev apple_sdk.sdk}/include/unistd.h\
 \    ;;\
 \  \*) ;;
 ' base/runtime/config/gen-posix-names.sh