diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index db8f6282b82..99b3de471fa 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -164,8 +164,8 @@ let version = "4.8.5";
           " --disable-libatomic " +  # libatomic requires libc
           " --disable-decimal-float" # libdecnumber requires libc
           else
-          (if crossDarwin then " --with-sysroot=${libcCross}/share/sysroot"
-           else                " --with-headers=${libcCross}/include") +
+          (if crossDarwin then " --with-sysroot=${libcCross.out}/share/sysroot"
+           else                " --with-headers=${libcCross.dev}/include") +
           # Ensure that -print-prog-name is able to find the correct programs.
           (stdenv.lib.optionalString (crossMingw || crossDarwin) (
             " --with-as=${binutilsCross}/bin/${cross.config}-as" +
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index 97bdeecb5a2..5c310300828 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -166,8 +166,8 @@ let version = "4.9.3";
           " --disable-libatomic " +  # libatomic requires libc
           " --disable-decimal-float" # libdecnumber requires libc
           else
-          (if crossDarwin then " --with-sysroot=${libcCross}/share/sysroot"
-           else                " --with-headers=${libcCross}/include") +
+          (if crossDarwin then " --with-sysroot=${libcCross.out}/share/sysroot"
+           else                " --with-headers=${libcCross.dev}/include") +
           # Ensure that -print-prog-name is able to find the correct programs.
           (stdenv.lib.optionalString (crossMingw || crossDarwin) (
             " --with-as=${binutilsCross}/bin/${cross.config}-as" +
diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index 2512e90ff03..3c9d8772f61 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -165,8 +165,8 @@ let version = "5.3.0";
           " --disable-libatomic " +  # libatomic requires libc
           " --disable-decimal-float" # libdecnumber requires libc
           else
-          (if crossDarwin then " --with-sysroot=${libcCross}/share/sysroot"
-           else                " --with-headers=${libcCross}/include") +
+          (if crossDarwin then " --with-sysroot=${libcCross.out}/share/sysroot"
+           else                " --with-headers=${libcCross.dev}/include") +
           # Ensure that -print-prog-name is able to find the correct programs.
           (stdenv.lib.optionalString (crossMingw || crossDarwin) (
             " --with-as=${binutilsCross}/bin/${cross.config}-as" +
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index be99237bfdb..d281488fd50 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -165,8 +165,8 @@ let version = "6.1.0";
           " --disable-libatomic " +  # libatomic requires libc
           " --disable-decimal-float" # libdecnumber requires libc
           else
-          (if crossDarwin then " --with-sysroot=${libcCross}/share/sysroot"
-           else                " --with-headers=${libcCross}/include") +
+          (if crossDarwin then " --with-sysroot=${libcCross.out}/share/sysroot"
+           else                " --with-headers=${libcCross.dev}/include") +
           # Ensure that -print-prog-name is able to find the correct programs.
           (stdenv.lib.optionalString (crossMingw || crossDarwin) (
             " --with-as=${binutilsCross}/bin/${cross.config}-as" +