diff --git a/pkgs/applications/science/misc/tulip/default.nix b/pkgs/applications/science/misc/tulip/default.nix
index 713238cc3f85..747231e738bc 100644
--- a/pkgs/applications/science/misc/tulip/default.nix
+++ b/pkgs/applications/science/misc/tulip/default.nix
@@ -1,6 +1,20 @@
-{ lib, stdenv, fetchurl, libxml2, freetype, libGLU, libGL, glew
-, qtbase, wrapQtAppsHook, autoPatchelfHook, python3
-, cmake, libjpeg, llvmPackages }:
+{
+  lib,
+  stdenv,
+  fetchurl,
+  libxml2,
+  freetype,
+  libGLU,
+  libGL,
+  glew,
+  qtbase,
+  wrapQtAppsHook,
+  autoPatchelfHook,
+  python3,
+  cmake,
+  libjpeg,
+  llvmPackages,
+}:
 
 stdenv.mkDerivation rec {
   pname = "tulip";
@@ -11,21 +25,37 @@ stdenv.mkDerivation rec {
     hash = "sha256-7z21WkPi1v2AGishDmXZPAedMjgXPRnpUiHTzEnc5LY=";
   };
 
-  nativeBuildInputs = [ cmake wrapQtAppsHook ]
-    ++ lib.optionals stdenv.hostPlatform.isLinux [ autoPatchelfHook ];
+  nativeBuildInputs = [
+    cmake
+    wrapQtAppsHook
+  ] ++ lib.optionals stdenv.hostPlatform.isLinux [ autoPatchelfHook ];
 
-  buildInputs = [ libxml2 freetype glew libjpeg qtbase python3 ]
+  buildInputs =
+    [
+      libxml2
+      freetype
+      glew
+      libjpeg
+      qtbase
+      python3
+    ]
     ++ lib.optionals stdenv.hostPlatform.isDarwin [ llvmPackages.openmp ]
-    ++ lib.optionals stdenv.hostPlatform.isLinux [ libGLU libGL ];
+    ++ lib.optionals stdenv.hostPlatform.isLinux [
+      libGLU
+      libGL
+    ];
 
   qtWrapperArgs = [ ''--prefix PATH : ${lib.makeBinPath [ python3 ]}'' ];
 
-  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.hostPlatform.isDarwin (toString [
-    # fatal error: 'Python.h' file not found
-    "-I${python3}/include/${python3.libPrefix}"
-    # error: format string is not a string literal (potentially insecure)
-    "-Wno-format-security"
-  ]);
+  env.NIX_CFLAGS_COMPILE =
+    # error: invalid conversion from 'unsigned char*' to 'char*'
+    "-fpermissive "
+    + (lib.optionalString stdenv.hostPlatform.isDarwin (toString [
+      # fatal error: 'Python.h' file not found
+      "-I${python3}/include/${python3.libPrefix}"
+      # error: format string is not a string literal (potentially insecure)
+      "-Wno-format-security"
+    ]));
 
   # FIXME: "make check" needs Docbook's DTD 4.4, among other things.
   doCheck = false;