diff --git a/src/unix/vpkEnv.Mod b/src/unix/vpkEnv.Mod
index 378b0c9..ceab822 100644
--- a/src/unix/vpkEnv.Mod
+++ b/src/unix/vpkEnv.Mod
@@ -81,15 +81,34 @@ BEGIN
   Strings.Append("/", path);
 END mkPkgDirPath;
 
-PROCEDURE mkBldDirPath*(VAR prefix, builddir: ARRAY OF CHAR);
+PROCEDURE mkBldDir*(VAR prefix: ARRAY OF CHAR): StringList.pstring;
+VAR
+  builddir: StringList.pstring;
+  ln : INTEGER;
 BEGIN
-  COPY(prefix, builddir);
-  createIfNotThere(builddir);
-  Strings.Append("/", builddir);
-  Strings.Append(vpkSettings.vpkBldDir, builddir);
-  createIfNotThere(builddir);
-  Strings.Append("/", builddir);
-END mkBldDirPath;
+  ln := 3 + Strings.Length(prefix) + Strings.Length(vpkSettings.vpkBldDir);
+  NEW(builddir, ln); 
+  COPY(prefix, builddir^);
+  createIfNotThere(builddir^);
+  Strings.Append("/", builddir^);
+  Strings.Append(vpkSettings.vpkBldDir, builddir^);
+  createIfNotThere(builddir^);
+  Strings.Append("/", builddir^);
+  RETURN builddir
+END mkBldDir;
+
+PROCEDURE mkCmd*(VAR p0, p1: ARRAY OF CHAR): StringList.pstring;
+VAR
+  cmd: StringList.pstring;
+  ln: INTEGER;
+BEGIN
+  ln := 2 + Strings.Length(p0) + Strings.Length(p1);
+  NEW(cmd, ln);
+  COPY(p0, cmd^);
+  Strings.Append(" ", cmd^);
+  Strings.Append(p1, cmd^);
+  RETURN cmd
+END mkCmd;
 
 PROCEDURE setConfFileName;
 VAR
diff --git a/src/vpkInstaller.Mod b/src/vpkInstaller.Mod
index fbfd6e6..69f04da 100644
--- a/src/vpkInstaller.Mod
+++ b/src/vpkInstaller.Mod
@@ -58,11 +58,10 @@ VAR
       keys, values: StringList.TStringList;
       k, v: StringList.pstring;
       b: BOOLEAN;
-      builddir: ARRAY 512 OF CHAR;
-      cmd, srcPath: StringList.pstring;
-      chdirRes: INTEGER;
+      builddir, cmd, srcPath: StringList.pstring;
+      res: INTEGER;
 BEGIN
-  vpkEnv.mkBldDirPath(prefix, builddir);
+  builddir := vpkEnv.mkBldDir(prefix);
   b := FALSE;
   depTree := resolve(package);
   i := 0;
@@ -76,19 +75,20 @@ BEGIN
       REPEAT
         k := keys.GetString(keys, j);
         v := values.GetString(values, j);
-        Out.Int(j, 0); Out.String(": "); Out.String(k^); Out.Ln;
-        Out.Int(j, 0); Out.String(": "); Out.String(v^); Out.Ln;
-        chdirRes := Platform.Chdir(builddir);
-        IF chdirRes # 0 THEN
-          Out.String("failed to change directory to "); Out.String(builddir); Out.Ln; Out.String("this should never happen."); Out.Ln; HALT(66);
+        res := Platform.Chdir(builddir^);
+        IF res # 0 THEN
+          Out.String("failed to change directory to "); Out.String(builddir^); Out.Ln; Out.String("this should never happen."); Out.Ln; HALT(66);
         END;
         srcPath := vpkEnv.getSrcRelPath(dep.name^, v^);
         Out.String(srcPath^); Out.Ln;
+        cmd := vpkEnv.mkCmd(k^, srcPath^);
+        Out.String(cmd^);
+        res := Platform.System(cmd^);
+        IF res # 0 THEN Out.String("failed to run build command"); Out.Ln END;
         INC(j)
       UNTIL j = keys.Count - 1;
     ELSE
       Out.String("no build info found for the package: "); Out.String(dep.name^); Out.Ln;
-      HALT(67);
     END;
     INC(i);
   UNTIL i = depTree.Count;
diff --git a/src/vpkSettings.Mod b/src/vpkSettings.Mod
index 26f7635..1bce707 100644
--- a/src/vpkSettings.Mod
+++ b/src/vpkSettings.Mod
@@ -18,7 +18,8 @@ CONST
   rmtTypGemiVal*  = "gemini";
   rmtTreeKey*     = "path";
   bldType*        = "Build";
-  defTreeVal*     = "https://github.com/vishaps/vipackTree";
+  (*defTreeVal*     = "https://github.com/vishaps/vipackTree";*)
+  defTreeVal*     = "git@github.com:vishaps/vipackTree";
   confTreeVal*    = defTreeVal;
   defTypVal*      = rmtTypGitVal;