diff --git a/pngcrush-1.8.11-buildfix-i586.patch b/pngcrush-1.8.11-buildfix-i586.patch
new file mode 100644
index 0000000..c2b0c17
--- /dev/null
+++ b/pngcrush-1.8.11-buildfix-i586.patch
@@ -0,0 +1,11 @@
+--- pngcrush-1.8.11/zutil.h.orig	2017-09-04 09:05:51.391314480 +0200
++++ pngcrush-1.8.11/zutil.h	2017-09-04 09:04:27.037805744 +0200
+@@ -30,7 +30,7 @@
+ #endif
+ 
+ #ifdef Z_SOLO
+-   typedef long ptrdiff_t;  /* guess -- will be caught if guess is wrong */
++/*   typedef long ptrdiff_t;  /* guess -- will be caught if guess is wrong */
+ #endif
+ 
+ #ifndef local
diff --git a/pngcrush.spec b/pngcrush.spec
index 7a45a81..7a589fe 100644
--- a/pngcrush.spec
+++ b/pngcrush.spec
@@ -1,5 +1,5 @@
 Name:          pngcrush
-Version:       1.8.10
+Version:       1.8.11
 Release:       1mamba
 Summary:       An optimizer for PNG (Portable Network Graphics) files
 Group:         Applications/Graphics
@@ -8,6 +8,7 @@ Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           http://pmt.sourceforge.net/pngcrush/
 Source:        http://downloads.sourceforge.net/project/pmt/pngcrush/%{version}/pngcrush-%{version}.tar.xz
+Patch0:        pngcrush-1.8.11-buildfix-i586.patch
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
@@ -23,6 +24,9 @@ Its main purpose is to reduce the size of the PNG IDAT datastream by trying vari
 
 %prep
 %setup -q
+%ifarch %{ix86}
+%patch0 -p1
+%endif
 
 %build
 %make
@@ -39,6 +43,9 @@ install -D -m0755 pngcrush %{buildroot}%{_bindir}/pngcrush
 %{_bindir}/pngcrush
 
 %changelog
+* Wed Jan 25 2017 Automatic Build System <autodist@mambasoft.it> 1.8.11-1mamba
+- automatic version update by autodist
+
 * Wed Nov 02 2016 Automatic Build System <autodist@mambasoft.it> 1.8.10-1mamba
 - automatic version update by autodist