fix source root locations.

These have changed following commit
c3255fe8ec.

See also:

- https://github.com/NixOS/nixpkgs/pull/31004
- https://github.com/NixOS/nixpkgs/pull/31106

pkgs/tools/cd-dvd/unetbootin/default.nix

@@ -12,7 +12,9 @@ stdenv.mkDerivation rec {
     sha256 = "18bbcrjk6ladr46kl3dvqz5pq2xcv4nnwmajqllb4sl3k1xqsngy";
   };
 
-  sourceRoot = "source/src/unetbootin";
+  setSourceRoot = ''
+    sourceRoot=$(echo */src/unetbootin)
+  '';
 
   buildInputs = [ qt4 ];
   nativeBuildInputs = [ makeWrapper qmake4Hook ];

pkgs/tools/compression/zstdmt/default.nix

@@ -11,7 +11,9 @@ stdenv.mkDerivation rec {
     owner = "mcmilk";
   };
 
-  sourceRoot = "zstdmt-v${version}-src/unix";
+  setSourceRoot = ''
+    sourceRoot=$(echo */unix)
+  '';
 
   buildInputs = [
     zstd lz4

pkgs/tools/inputmethods/zinnia/default.nix

@@ -11,7 +11,9 @@ stdenv.mkDerivation rec {
     sha256 = "1izjy5qw6swg0rs2ym2i72zndb90mwrfbd1iv8xbpwckbm4899lg";
   };
 
-  setSourceRoot = "export sourceRoot=$(echo zinnia-*/zinnia/)";
+  setSourceRoot = ''
+    sourceRoot=$(echo */zinnia)
+  '';
 
   meta = with stdenv.lib; {
     description = "Online hand recognition system with machine learning";

pkgs/tools/misc/cloc/default.nix

@@ -11,7 +11,9 @@ stdenv.mkDerivation rec {
     sha256 = "1ihma4f6f92jp1mvzr4rjrgyh9m5wzrlxngaxfn7g0a8r2kyi65b";
   };
 
-  sourceRoot = "source/Unix";
+  setSourceRoot = ''
+    sourceRoot=$(echo */Unix)
+  '';
 
   buildInputs = [ makeWrapper perl AlgorithmDiff RegexpCommon ];
 

pkgs/tools/networking/reaver-wps/default.nix

@@ -13,7 +13,10 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ libpcap sqlite ];
 
-  sourceRoot = "reaver-${version}/src";
+
+  setSourceRoot = ''
+    sourceRoot=$(echo */src)
+  '';
 
   configureFlags = "--sysconfdir=${confdir}";
 

pkgs/tools/text/zimreader/default.nix

@@ -23,7 +23,9 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
   buildInputs = [ automake autoconf libtool zimlib cxxtools tntnet ];
-  setSourceRoot = "cd openzim-*/zimreader; export sourceRoot=`pwd`";
+  setSourceRoot = ''
+    sourceRoot=$(echo */zimreader)
+  '';
   preConfigure = "./autogen.sh";
 
   meta = {

pkgs/tools/text/zimwriterfs/default.nix

@@ -28,7 +28,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ automake autoconf libtool pkgconfig ];
   buildInputs = [ file icu libgumbo lzma zimlib zlib xapian ];
-  setSourceRoot = "cd openzim-*/zimwriterfs; export sourceRoot=`pwd`";
+  setSourceRoot = ''
+    sourceRoot=$(echo */zimwriterfs)
+  '';
   preConfigure = "./autogen.sh";
 
   meta = {