* Start of the setuid helper (the program that performs the operations

that have to be done as root: running builders under different uids,
  changing ownership of build results, and deleting paths in the store
  with the wrong ownership).

src/nix-setuid-helper/Makefile.am

@@ -0,0 +1,8 @@
+libexec_PROGRAMS = nix-setuid-helper
+
+nix_setuid_helper_SOURCES = main.cc
+nix_setuid_helper_LDADD = ../libutil/libutil.la \
+ ../boost/format/libformat.la ${aterm_lib}
+
+AM_CXXFLAGS = \
+ -I$(srcdir)/.. $(aterm_include) -I$(srcdir)/../libutil

src/nix-setuid-helper/main.cc

@@ -0,0 +1,3 @@
+int main(int argc, char * * argv)
+{
+}