diff -Naurd mpfr-2.2.0/lngamma.c mpfr-2.2.0-p1/lngamma.c
--- mpfr-2.2.0/lngamma.c	2005-09-09 15:17:58.000000000 +0000
+++ mpfr-2.2.0-p1/lngamma.c	2005-09-29 11:27:04.000000000 +0000
@@ -167,8 +167,8 @@
   compared = mpfr_cmp_ui (z0, 1);
 
 #ifndef IS_GAMMA
-  if (compared == 0) /* lngamma(1) = +0 */
-    return mpfr_set_ui (y, 0, GMP_RNDN);
+  if (compared == 0 || (compared > 0 && mpfr_cmp_ui (z0, 2) == 0))
+    return mpfr_set_ui (y, 0, GMP_RNDN);  /* lngamma(1 or 2) = +0 */
 #endif
 
   mpfr_init2 (s, MPFR_PREC_MIN);
diff -Naurd mpfr-2.2.0/tests/tlngamma.c mpfr-2.2.0-p1/tests/tlngamma.c
--- mpfr-2.2.0/tests/tlngamma.c	2005-09-09 15:17:59.000000000 +0000
+++ mpfr-2.2.0-p1/tests/tlngamma.c	2005-09-29 11:20:34.000000000 +0000
@@ -79,7 +79,7 @@
 
   mpfr_set_ui (x, 1, GMP_RNDN);
   mpfr_lngamma (y, x, GMP_RNDN);
-  if (mpfr_cmp_ui (y, 0))
+  if (mpfr_cmp_ui (y, 0) || MPFR_IS_NEG (y))
     {
       printf ("Error for lngamma(1)\n");
       exit (1);
@@ -93,6 +93,14 @@
       exit (1);
     }
 
+  mpfr_set_ui (x, 2, GMP_RNDN);
+  mpfr_lngamma (y, x, GMP_RNDN);
+  if (mpfr_cmp_ui (y, 0) || MPFR_IS_NEG (y))
+    {
+      printf ("Error for lngamma(2)\n");
+      exit (1);
+    }
+
   mpfr_set_prec (x, 53);
   mpfr_set_prec (y, 53);