diff --git a/jansson.spec b/jansson.spec
index faf0695..d21d810 100644
--- a/jansson.spec
+++ b/jansson.spec
@@ -1,6 +1,6 @@
 Name:          jansson
-Version:       2.10
-Release:       1mamba
+Version:       2.11
+Release:       2mamba
 Summary:       A C library for encoding, decoding and manipulating JSON data
 Group:         System/Libraries
 Vendor:        openmamba
@@ -39,8 +39,11 @@ This package contains libraries and header files for developing applications tha
 %prep
 %setup -q
 
+sed -i "s|@libdir@|%{_libdir}|" jansson.pc.in
+
 %build
 %cmake -d build \
+   -Dexec_prefix= \
    -DJANSSON_BUILD_SHARED_LIBS=TRUE \
    -DJANSSON_INSTALL_LIB_DIR=%{_libdir} \
    -DJANSSON_INSTALL_CMAKE_DIR=%{_libdir}/cmake/jansson
@@ -77,6 +80,12 @@ This package contains libraries and header files for developing applications tha
 %doc CHANGES README.rst
 
 %changelog
+* Thu Mar 29 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 2.11-2mamba
+- fix libdir in pkgconfig file
+
+* Thu Mar 29 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 2.11-1mamba
+- update to 2.11
+
 * Sat Mar 18 2017 Automatic Build System <autodist@mambasoft.it> 2.10-1mamba
 - automatic version update by autodist