We already have these in Debian

--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,7 @@ GTGCFLAGS = -I$(top_srcdir)/extlib/gtg/t
 GTGLDFLAGS = $(top_builddir)/extlib/gtg/libgtg.la
 endif # AMEXTERNGTG
 
-SUBDIRS = extlib/ \
+SUBDIRS = \
 	  src/core/ \
 	  src/modules/omp \
 	  src/modules/mpi \
--- a/configure.ac
+++ b/configure.ac
@@ -851,10 +851,7 @@ AM_CONDITIONAL([ARM], [test "x$arch_str"
 
 AM_CONDITIONAL([WITHDOC], [test "$build_doc" = "yes"])
 
-AC_CONFIG_SUBDIRS([extlib/opari2 extlib/litl extlib/gtg])
-
 AC_OUTPUT([Makefile eztrace.pc \
-		    extlib/Makefile \
 		    src/core/Makefile \
 		    src/modules/omp/Makefile \
 		    src/modules/mpi/Makefile \
