diff --git a/libpng.spec b/libpng.spec
index 219a8cd..f6d24c9 100644
--- a/libpng.spec
+++ b/libpng.spec
@@ -1,7 +1,7 @@
 %define apiver %(echo %version | cut -d. -f1-2 | tr -d .)
 Name:          libpng
 Version:       1.6.29
-Release:       1mamba
+Release:       2mamba
 Summary:       A library of functions for manipulating PNG image format files
 Group:         System/Libraries
 Vendor:        openmamba
@@ -126,6 +126,9 @@ ln -s libpng%{apiver}.so %{buildroot}%{_prefix}/lib/libpng.so
 %endif
 
 %changelog
+* Fri Aug 04 2017 Silvan Calarco <silvan.calarco@mambasoft.it> 1.6.29-2mamba
+- relink with /lib64/libpthread.so.0 for IFUNC symbol longjmp
+
 * Thu Mar 30 2017 Automatic Build System <autodist@mambasoft.it> 1.6.29-1mamba
 - automatic version update by autodist