The following patch fixes compatibility with gcc-3.4.1 and later.
To apply the patch, go into the sftpd directory and run

  sftpd$ patch <gcc-3.4.patch.txt


Index: stlsubst.h
===================================================================
RCS file: /home/scott/cvsroot/sftpd/stlsubst.h,v
retrieving revision 1.6
diff -c -r1.6 stlsubst.h
*** stlsubst.h	17 Sep 2000 12:52:42 -0000	1.6
--- stlsubst.h	25 Jan 2005 01:18:22 -0000
***************
*** 47,53 ****
    int size;
  
  public:
!   vector(int s=0) : data(new T[max(s,1)]), size(s) {}
    ~vector() { delete[] data; }
  
    T& operator[] (int i) { return data[i]; }
--- 47,53 ----
    int size;
  
  public:
!   vector(int s=0) : data(new T[mymax(s,1)]), size(s) {}
    ~vector() { delete[] data; }
  
    T& operator[] (int i) { return data[i]; }
***************
*** 63,69 ****
    T *newdata = new T[newsize];
  
    // copy the elements stored in both
!   for (int i=0; i<min(size,newsize); i++) {
      newdata[i] = data[i];
    }
  
--- 63,69 ----
    T *newdata = new T[newsize];
  
    // copy the elements stored in both
!   for (int i=0; i<mymin(size,newsize); i++) {
      newdata[i] = data[i];
    }