diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e23c6c..9a88c5f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,6 +63,8 @@ ENDIF(LIBNFC_CONFFILES_MODE)
 option (BUILD_EXAMPLES "build examples ON/OFF" ON)
 option (BUILD_UTILS "build utils ON/OFF" ON)
 
+option (BUILD_DEBPKG "build debian package ON/OFF" OFF)
+
 
 # Doxygen
 SET(builddir "${CMAKE_BINARY_DIR}")
@@ -224,10 +226,14 @@ IF(WIN32)
   SET(CPACK_GENERATOR "ZIP")
 ELSE(WIN32)
   SET(CPACK_GENERATOR "TBZ2")
+  IF(BUILD_DEBPKG)
+    SET(CPACK_GENERATOR "DEB")
+  ENDIF(BUILD_DEBPKG)
 ENDIF(WIN32)
 
 SET(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Near Field Communication (NFC) library")
 SET(CPACK_PACKAGE_VENDOR "Roel Verdult")
+SET(CPACK_PACKAGE_CONTACT "Roel Verdul <roel@libnfc.org>")
 
 #Readme file
 IF(WIN32)
diff --git a/libnfc/buses/i2c.c b/libnfc/buses/i2c.c
index a0ee189..a37372d 100644
--- a/libnfc/buses/i2c.c
+++ b/libnfc/buses/i2c.c
@@ -135,6 +135,8 @@ i2c_read(i2c_device id, uint8_t *pbtRx, const size_t szRx)
 
   if (recCount < 0) {
     res = NFC_EIO;
+    log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR,
+            "Error: read only %d bytes (%d expected) (%s).", (int)recCount, (int) szRx, strerror(errno));
   } else {
     if (recCount < (ssize_t)szRx) {
       res = NFC_EINVARG;
@@ -167,7 +169,7 @@ i2c_write(i2c_device id, const uint8_t *pbtTx, const size_t szTx)
     return NFC_SUCCESS;
   } else {
     log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR,
-            "Error: wrote only %d bytes (%d expected).", (int)writeCount, (int) szTx);
+            "Error: wrote only %d bytes (%d expected) (%s).", (int)writeCount, (int) szTx, strerror(errno));
     return NFC_EIO;
   }
 }