diff --git a/ap/libc/glibc/glibc-2.23/math/test-signgam-finite.c b/ap/libc/glibc/glibc-2.23/math/test-signgam-finite.c
new file mode 100644
index 0000000..3d52bf4
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/math/test-signgam-finite.c
@@ -0,0 +1,65 @@
+/* Test lgamma functions set signgam for -ffinite-math-only (bug 19211).
+   Copyright (C) 2015-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <math.h>
+#include <stdio.h>
+
+#define RUN_TESTS(FUNC, TYPE)					\
+  do								\
+    {								\
+      volatile TYPE a, b, c __attribute__ ((unused));		\
+      a = 0.5;							\
+      b = -0.5;							\
+      signgam = 123;						\
+      c = FUNC (a);						\
+      if (signgam == 1)						\
+	puts ("PASS: " #FUNC " (0.5) setting signgam");		\
+      else							\
+	{							\
+	  puts ("FAIL: " #FUNC " (0.5) setting signgam");	\
+	  result = 1;						\
+	}							\
+      signgam = 123;						\
+      c = FUNC (b);						\
+      if (signgam == -1)					\
+	puts ("PASS: " #FUNC " (-0.5) setting signgam");	\
+      else							\
+	{							\
+	  puts ("FAIL: " #FUNC " (-0.5) setting signgam");	\
+	  result = 1;						\
+	}							\
+    }								\
+  while (0)
+
+static int
+do_test (void)
+{
+  int result = 0;
+  RUN_TESTS (lgammaf, float);
+  RUN_TESTS (gammaf, float);
+  RUN_TESTS (lgamma, double);
+  RUN_TESTS (gamma, double);
+#ifndef NO_LONG_DOUBLE
+  RUN_TESTS (lgammal, long double);
+  RUN_TESTS (gammal, long double);
+#endif
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"