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-rw-r--r--pkgs/development/compilers/mcpp/default.nix4
-rw-r--r--pkgs/development/compilers/mcpp/readlink.patch24
2 files changed, 28 insertions, 0 deletions
diff --git a/pkgs/development/compilers/mcpp/default.nix b/pkgs/development/compilers/mcpp/default.nix
index 0f556f85daa..e8eb62a15f1 100644
--- a/pkgs/development/compilers/mcpp/default.nix
+++ b/pkgs/development/compilers/mcpp/default.nix
@@ -14,6 +14,10 @@ stdenv.mkDerivation (finalAttrs: {
     hash= "sha256-T4feegblOeG+NU+c+PAobf8HT8KDSfcINkRAa1hNpkY=";
   };
 
+  patches = [
+    ./readlink.patch
+  ];
+
   configureFlags = [ "--enable-mcpplib" ];
 
   meta = with lib; {
diff --git a/pkgs/development/compilers/mcpp/readlink.patch b/pkgs/development/compilers/mcpp/readlink.patch
new file mode 100644
index 00000000000..0f5fc6d7e96
--- /dev/null
+++ b/pkgs/development/compilers/mcpp/readlink.patch
@@ -0,0 +1,24 @@
+From 1c4b0f26614bff331eb8a9f2b514309af6f31fd0 Mon Sep 17 00:00:00 2001
+From: Jose <pepone@users.noreply.github.com>
+Date: Mon, 26 Jun 2023 16:43:43 +0200
+Subject: [PATCH] Add 'unistd' header for readlink (#8)
+
+---
+ src/system.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/system.c b/src/system.c
+index a3501f9..646caf6 100644
+--- a/src/system.c
++++ b/src/system.c
+@@ -37,6 +37,11 @@
+  *      2. append the system-dependent routines in this file.
+  */
++
++#ifndef _MSC_VER
++#  include <unistd.h> // For readlink()
++#endif
++
+ #if PREPROCESSED
+ #include    "mcpp.H"
+ #else