From 32d45883a8c34cf9d4e98c14ac601a2c4ecf8313 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sat, 29 Jan 2022 12:35:39 +0000
Subject: [PATCH] libf2c: explicitly disable parallel builds

Attempt to enable build parallelism exposes missing dependency:

  libf2c> main.c:4:10: fatal error: signal1.h: No such file or directory
  libf2c>     4 | #include "signal1.h"
  libf2c>       |          ^~~~~~~~~~~
---
 pkgs/development/libraries/libf2c/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/libraries/libf2c/default.nix b/pkgs/development/libraries/libf2c/default.nix
index 5a5d8b93057a..a2cb4d2bd246 100644
--- a/pkgs/development/libraries/libf2c/default.nix
+++ b/pkgs/development/libraries/libf2c/default.nix
@@ -27,6 +27,10 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "format" ];
 
+  # Makefile is missing depepdencies on generated headers:
+  #   main.c:4:10: fatal error: signal1.h: No such file or directory
+  enableParallelBuilding = false;
+
   meta = {
     description = "F2c converts Fortran 77 source code to C";
     homepage = "http://www.netlib.org/f2c/";