use std::fabs. Compilation issue on Fedora25

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/persistence_representation_integration@2505 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: d0e3e91bea107a8f392f1d57462d489df01fb98b

1 files changed, 2 insertions, 1 deletions

diff --git a/src/Persistence_representations/include/gudhi/common_persistence_representations.h b/src/Persistence_representations/include/gudhi/common_persistence_representations.h
index 61a3274d..44e125a7 100644
--- a/src/Persistence_representations/include/gudhi/common_persistence_representations.h
+++ b/src/Persistence_representations/include/gudhi/common_persistence_representations.h
@@ -25,6 +25,7 @@
 
 #include <utility>
 #include <string>
+#include <cmath>
 
 namespace Gudhi {
 namespace Persistence_representations {
@@ -39,7 +40,7 @@ double epsi = 0.000005;
  *  the top of the file. Setting up the epsi gives the user a tolerance on what should be consider equal.
 **/
 inline bool almost_equal(double a, double b) {
-  if (fabs(a - b) < epsi) return true;
+  if (std::fabs(a - b) < epsi) return true;
   return false;
 }