diff --git a/tests/timecatalan.cc b/tests/timecatalan.cc
index 4ddb6be..36c1bf7 100644
--- a/tests/timecatalan.cc
+++ b/tests/timecatalan.cc
@@ -8,6 +8,18 @@
 #include <cln/timing.h>
 #include "float/lfloat/cl_LF.h"
 #include <iostream>
+namespace cln
+{
+// FIXME: using internal functions is a bad idea (even if it works
+// on some ELF systems)
+extern cl_LF compute_catalanconst_ramanujan (uintC len);
+extern cl_LF compute_catalanconst_ramanujan_fast (uintC len);
+extern cl_LF compute_catalanconst_expintegral1 (uintC len);
+extern cl_LF compute_catalanconst_expintegral2 (uintC len);
+extern cl_LF compute_catalanconst_cvz1 (uintC len);
+extern cl_LF compute_catalanconst_cvz2 (uintC len);
+}
+
 using namespace cln;
 using namespace std;
 
@@ -21,12 +33,8 @@ int main (int argc, char * argv[])
 	if (argc < 2)
 		exit(1);
 	uintL len = atoi(argv[1]);
-	extern cl_LF compute_catalanconst_ramanujan (uintC len);
-	extern cl_LF compute_catalanconst_ramanujan_fast (uintC len);
-	extern cl_LF compute_catalanconst_expintegral1 (uintC len);
-	extern cl_LF compute_catalanconst_expintegral2 (uintC len);
-	extern cl_LF compute_catalanconst_cvz1 (uintC len);
-	extern cl_LF compute_catalanconst_cvz2 (uintC len);
+
+
 	cl_LF p;
 	ln(cl_I_to_LF(1000,len+10)); // fill cache
 	{ CL_TIMING;
diff --git a/tests/timeeuler.cc b/tests/timeeuler.cc
index 40f44ea..f0730e6 100644
--- a/tests/timeeuler.cc
+++ b/tests/timeeuler.cc
@@ -7,6 +7,19 @@
 #include <cstring>
 #include <cln/timing.h>
 #include "float/lfloat/cl_LF.h"
+namespace cln
+{
+// FIXME: don't use internal functions.
+extern cl_LF compute_eulerconst (uintC len);
+extern cl_LF compute_eulerconst_expintegral (uintC len);
+extern cl_LF compute_eulerconst_expintegral1 (uintC len);
+extern cl_LF compute_eulerconst_expintegral2 (uintC len);
+extern cl_LF compute_eulerconst_besselintegral1 (uintC len);
+extern cl_LF compute_eulerconst_besselintegral2 (uintC len);
+extern cl_LF compute_eulerconst_besselintegral3 (uintC len);
+extern cl_LF compute_eulerconst_besselintegral4 (uintC len);
+}
+
 using namespace cln;
 
 int main (int argc, char * argv[])
@@ -19,14 +32,8 @@ int main (int argc, char * argv[])
 	if (argc < 2)
 		exit(1);
 	uintL len = atoi(argv[1]);
-	extern cl_LF compute_eulerconst (uintC len);
-	extern cl_LF compute_eulerconst_expintegral (uintC len);
-	extern cl_LF compute_eulerconst_expintegral1 (uintC len);
-	extern cl_LF compute_eulerconst_expintegral2 (uintC len);
-	extern cl_LF compute_eulerconst_besselintegral1 (uintC len);
-	extern cl_LF compute_eulerconst_besselintegral2 (uintC len);
-	extern cl_LF compute_eulerconst_besselintegral3 (uintC len);
-	extern cl_LF compute_eulerconst_besselintegral4 (uintC len);
+
+
 	cl_LF p;
 	ln(cl_I_to_LF(1000,len+10)); // fill cache
 #if 0
diff --git a/tests/timeexp1.cc b/tests/timeexp1.cc
index fac40e3..5aeab13 100644
--- a/tests/timeexp1.cc
+++ b/tests/timeexp1.cc
@@ -6,6 +6,12 @@
 #include <cstdlib>
 #include <cstring>
 #include <cln/timing.h>
+namespace cln
+{
+// FIXME: don't use internal functions!
+extern cl_LF compute_exp1 (uintC len);
+}
+
 using namespace cln;
 
 int main (int argc, char * argv[])
@@ -18,7 +24,6 @@ int main (int argc, char * argv[])
 	if (argc < 2)
 		exit(1);
 	uintL len = atoi(argv[1]);
-	extern cl_LF compute_exp1 (uintC len);
 	cl_LF p;
 	{ CL_TIMING;
 	  for (int rep = repetitions; rep > 0; rep--)
diff --git a/tests/timezeta3.cc b/tests/timezeta3.cc
index 898b958..cbdb8a0 100644
--- a/tests/timezeta3.cc
+++ b/tests/timezeta3.cc
@@ -6,6 +6,15 @@
 #include <cstring>
 #include <cln/timing.h>
 #include "float/lfloat/cl_LF.h"
+namespace cln
+{
+// FIXME: don't use internal functions.
+extern cl_LF zeta (int s, uintC len);
+extern cl_LF compute_zeta_exp (int s, uintC len);
+extern cl_LF compute_zeta_cvz1 (int s, uintC len);
+extern cl_LF compute_zeta_cvz2 (int s, uintC len);
+extern cl_LF zeta3 (uintC len);
+}
 using namespace cln;
 #include <iostream>
 using namespace std;
@@ -20,11 +29,6 @@ int main (int argc, char * argv[])
 	if (argc < 2)
 		exit(1);
 	uintL len = atoi(argv[1]);
-	extern cl_LF zeta (int s, uintC len);
-	extern cl_LF compute_zeta_exp (int s, uintC len);
-	extern cl_LF compute_zeta_cvz1 (int s, uintC len);
-	extern cl_LF compute_zeta_cvz2 (int s, uintC len);
-	extern cl_LF zeta3 (uintC len);
 	cl_LF p;
 	ln(cl_I_to_LF(1000,len+10)); // fill cache
 	{ CL_TIMING;