autogen: make reproducible

pkgs/development/tools/misc/autogen/default.nix

@@ -42,13 +42,23 @@ stdenv.mkDerivation rec {
     guile libxml2
   ];
 
-  configureFlags = stdenv.lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
-    "--with-libxml2=${libxml2.dev}"
-    "--with-libxml2-cflags=-I${libxml2.dev}/include/libxml2"
-    # the configure check for regcomp wants to run a host program
-    "libopts_cv_with_libregex=yes"
-    #"MAKEINFO=${buildPackages.texinfo}/bin/makeinfo"
-  ];
+  configureFlags =
+    [
+      # Make sure to use a static value for the timeout. If we do not set a value
+      # here autogen will select one based on the execution time of the configure
+      # phase which is not really reproducible.
+      #
+      # If you are curious about the number 78, it has been cargo-culted from
+      # Debian: https://salsa.debian.org/debian/autogen/-/blob/master/debian/rules#L21
+      "--enable-timeout=78"
+    ]
+    ++ (stdenv.lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "--with-libxml2=${libxml2.dev}"
+      "--with-libxml2-cflags=-I${libxml2.dev}/include/libxml2"
+      # the configure check for regcomp wants to run a host program
+      "libopts_cv_with_libregex=yes"
+      #"MAKEINFO=${buildPackages.texinfo}/bin/makeinfo"
+    ]);
 
   #doCheck = true; # not reliable