dlx: unbreak, modernize (#406552)

pkgs/by-name/dl/dlx/package.nix

@@ -6,18 +6,21 @@
 
 stdenv.mkDerivation {
   pname = "dlx";
-  version = "2012-07-08";
+  version = "0-unstable-2012-07-08";
 
   src = fetchzip {
     url = "https://www.davidviner.com/zip/dlx/dlx.zip";
-    sha256 = "0508linnar9ivy3xr99gzrb2l027ngx12dlxaxs7w67cnwqnb0dg";
+    hash = "sha256-r4FlMbfsGH50V502EfqzRwAqVv4vpdyH3zFlZW2kCBQ=";
   };
 
-  makeFlags = [
-    "CC=${stdenv.cc.targetPrefix}cc"
-    "LINK=${stdenv.cc.targetPrefix}cc"
-    "CFLAGS=-O2"
-  ];
+  preBuild = ''
+    makeFlagsArray+=(
+      CC="${stdenv.cc.targetPrefix}cc"
+      LINK="${stdenv.cc.targetPrefix}cc"
+      CFLAGS="-O2 -Wno-implicit-function-declaration"
+    )
+  '';
+
   hardeningDisable = [ "format" ];
 
   installPhase = ''
@@ -28,10 +31,10 @@ stdenv.mkDerivation {
     mv README.txt MANUAL.TXT $out/share/dlx/doc/
   '';
 
-  meta = with lib; {
+  meta = {
     homepage = "https://www.davidviner.com/dlx.html?name=DLX+Simulator";
     description = "DLX simulator written in C";
-    license = licenses.gpl2Only;
-    platforms = platforms.linux;
+    license = lib.licenses.gpl2Only;
+    platforms = lib.platforms.linux;
   };
 }