diff -u slgsl-0.7.0/debian/changelog slgsl-0.7.0/debian/changelog
--- slgsl-0.7.0/debian/changelog
+++ slgsl-0.7.0/debian/changelog
@@ -1,3 +1,10 @@
+slgsl (0.7.0-5.2) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix FTBFS due to detect gsl error. (Closes: #796402)
+
+ -- YunQiang Su <syq@debian.org>  Mon, 16 Nov 2015 20:40:25 +0800
+
 slgsl (0.7.0-5.1) unstable; urgency=low
 
   * Non-maintainer upload.
diff -u slgsl-0.7.0/debian/patches/series slgsl-0.7.0/debian/patches/series
--- slgsl-0.7.0/debian/patches/series
+++ slgsl-0.7.0/debian/patches/series
@@ -1 +1,2 @@
+find_gsl.diff
 use-fPIC.patch
only in patch2:
unchanged:
--- slgsl-0.7.0.orig/debian/patches/find_gsl.diff
+++ slgsl-0.7.0/debian/patches/find_gsl.diff
@@ -0,0 +1,20 @@
+Index: b/configure
+===================================================================
+--- a/configure
++++ b/configure
+@@ -5957,13 +5957,12 @@ echo $ECHO_N "checking for the gsl libra
+ 
+ 
+ # Check whether --with-gsl was given.
+-if test "${with_gsl+set}" = set; then
++if test "x${with_gsl+set}" != "x"; then
+   withval=$with_gsl; jd_with_gsl_arg=$withval
+ else
+-  jd_with_gsl_arg=unspecified
++  jd_with_gsl_arg=/usr
+ fi
+ 
+-
+  case "x$jd_with_gsl_arg" in
+    xno)
+      jd_with_gsl_library="no"