From 48197c2ea1e4883a5b379c47fc3d50325f6269b8 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@highsecure.ru>
Date: Sun, 9 Jun 2013 15:47:34 +0100
Subject: [PATCH] Test for expl function presence.

---
 CMakeLists.txt          | 1 +
 config.h.in             | 2 ++
 src/classifiers/bayes.c | 4 ++++
 3 files changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c65bfb9c..fe0c2cab8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -883,6 +883,7 @@ CHECK_FUNCTION_EXISTS(wait4 HAVE_WAIT4)
 CHECK_FUNCTION_EXISTS(waitpid HAVE_WAITPID)
 CHECK_FUNCTION_EXISTS(flock HAVE_FLOCK)
 CHECK_FUNCTION_EXISTS(tanhl HAVE_TANHL)
+CHECK_FUNCTION_EXISTS(expl HAVE_EXPL)
 CHECK_FUNCTION_EXISTS(sendfile HAVE_SENDFILE)
 CHECK_FUNCTION_EXISTS(mkstemp HAVE_MKSTEMP)
 CHECK_FUNCTION_EXISTS(setitimer HAVE_SETITIMER)
diff --git a/config.h.in b/config.h.in
index 0ecb53059..a39f2d17e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -144,6 +144,8 @@
 
 #cmakedefine HAVE_TANHL          1
 
+#cmakedefine HAVE_EXPL           1
+
 #cmakedefine HAVE_SA_SIGINFO     1
 
 #cmakedefine DEBUG_MODE          1
diff --git a/src/classifiers/bayes.c b/src/classifiers/bayes.c
index 77e02ea6b..f8aed3ac7 100644
--- a/src/classifiers/bayes.c
+++ b/src/classifiers/bayes.c
@@ -121,7 +121,11 @@ inv_chi_square (gdouble value, gint freedom_deg)
 
 	value /= 2.;
 	errno = 0;
+#ifdef HAVE_EXPL
 	prob = expl (-value);
+#else
+	prob = exp (-value);
+#endif
 	if (errno == ERANGE) {
 		msg_err ("exp overflow");
 		return 0;
-- 
2.39.5