some improvements -> crosstool can build the first few things

esp32-tools.nix

-{ stdenv, fetchurl, fetchgit, fetchFromGitHub, espressif-crosstool-ng, gcc, binutils, which, lib, gnum4, perl }:
+{ lib, stdenv, fetchurl, fetchgit, fetchFromGitHub, espressif-crosstool-ng, autoconf, automake, bison, flex, unzip, help2man, libtool, which, texinfo, file, wget, gnum4, perl }:
 let
   srcs = import ./sources.nix { inherit fetchFromGitHub; };
   srcs2 = import ./sources2.nix { inherit fetchurl fetchgit fetchFromGitHub; };
@@ -9,7 +9,7 @@ in stdenv.mkDerivation {
   additionalSources = lib.strings.concatStringsSep "\n"
     (lib.attrsets.mapAttrsToList (name: drv: if drv ? outPath then "${name} ${drv.outPath}" else "") srcs2);
 
-  nativeBuildInputs = [ espressif-crosstool-ng gcc binutils which gnum4 perl ];
+  nativeBuildInputs = [ espressif-crosstool-ng autoconf automake bison flex unzip help2man libtool which texinfo file wget gnum4 perl ];
 
   dontConfigure = true;
   dontInstall = true;
@@ -22,16 +22,19 @@ in stdenv.mkDerivation {
     echo "CT_FORBID_DOWNLOAD=y" >>.config
     mkdir tarballs
     while read name path ; do
-      echo ln -s $path tarballs/$name
-      ln -s $path tarballs/$name
-      if [ -d tarballs/$name/ ] ; then
+      printf "%-20s -> %s" $name $path
+      if [ -d $path ] ; then
         # ugly but works...
-        tar -C tarballs -cjf tarballs/$name.tar.bz2 $name
+        cp -aHT $path tarballs/$name
+        chmod -R u+w tarballs/$name
+        tar -C tarballs -cjf tarballs/$name.tar.bz2 $name/
+      else
+        ln -s $path tarballs/$name
       fi
     done <<<"$additionalSources"
 
-    echo "$additionalSources"
     CT_USE_SOURCES_FROM_NIXOS=y \
-      ct-ng build
+      ct-ng build \
+      || ( tail -n 100 build.log ; exit 1 )
   '';
 }