diff --git a/pkgs/build-support/clang-wrapper/ld-wrapper.sh b/pkgs/build-support/clang-wrapper/ld-wrapper.sh
index ae45c62d460..105d1670eb6 100644
--- a/pkgs/build-support/clang-wrapper/ld-wrapper.sh
+++ b/pkgs/build-support/clang-wrapper/ld-wrapper.sh
@@ -48,8 +48,8 @@ extra=()
 extraBefore=()
 
 if test -z "$NIX_LDFLAGS_SET"; then
-    extra=(${extra[@]} $NIX_LDFLAGS)
-    extraBefore=(${extraBefore[@]} $NIX_LDFLAGS_BEFORE)
+    extra+=($NIX_LDFLAGS $NIX_LDFLAGS_AFTER)
+    extraBefore+=($NIX_LDFLAGS_BEFORE)
 fi
 
 
diff --git a/pkgs/build-support/gcc-wrapper/ld-wrapper.sh b/pkgs/build-support/gcc-wrapper/ld-wrapper.sh
index ff3f320e0d8..5b8af068a00 100644
--- a/pkgs/build-support/gcc-wrapper/ld-wrapper.sh
+++ b/pkgs/build-support/gcc-wrapper/ld-wrapper.sh
@@ -48,8 +48,8 @@ extra=()
 extraBefore=()
 
 if test -z "$NIX_LDFLAGS_SET"; then
-    extra=(${extra[@]} $NIX_LDFLAGS)
-    extraBefore=(${extraBefore[@]} $NIX_LDFLAGS_BEFORE)
+    extra+=($NIX_LDFLAGS $NIX_LDFLAGS_AFTER)
+    extraBefore+=($NIX_LDFLAGS_BEFORE)
 fi
 
 
diff --git a/pkgs/stdenv/nix/default.nix b/pkgs/stdenv/nix/default.nix
index 84bcea7f643..ba693443b05 100644
--- a/pkgs/stdenv/nix/default.nix
+++ b/pkgs/stdenv/nix/default.nix
@@ -17,12 +17,10 @@ import ../generic rec {
         xargsFlags=" "
       fi
     '' + (if stdenv.isDarwin then ''
-      export NIX_CFLAGS_COMPILE="--sysroot=/var/empty"
-      if xcodePath=$(/usr/bin/xcrun --show-sdk-path 2> /dev/null); then
-        NIX_CFLAGS_COMPILE+=" -idirafter $xcodePath/usr/include -F$xcodePath/System/Library/Frameworks"
-      else
-        NIX_CFLAGS_COMPILE+=" -idirafter /usr/include -F/System/Library/Frameworks"
-      fi
+      export NIX_CFLAGS_COMPILE+=" --sysroot=/var/empty"
+      xcodePath=$(/usr/bin/xcrun --show-sdk-path 2> /dev/null || true)
+      export NIX_CFLAGS_COMPILE+=" -idirafter $xcodePath/usr/include -F$xcodePath/System/Library/Frameworks"
+      export NIX_LDFLAGS_AFTER+=" -L$xcodePath/usr/lib"
     '' else "");
 
   initialPath = (import ../common-path.nix) {pkgs = pkgs;};