diff --git a/.travis.yml b/.travis.yml
index 0350198d..fdf6cbd5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,33 @@
 dist: trusty
 language: cpp
-compiler:
-  - gcc
-# - clang
+
+matrix:
+  include:
+    - compiler: gcc
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-precise-3.7
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-5-multilib
+            - gcc-5-multilib
+
+    - compiler: clang
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-precise-3.7
+            - ubuntu-toolchain-r-test
+          packages:
+            - clang-3.7
+
 #before_install:
 # - sudo pip install cpp-coveralls
-#install:
+
+install:
+  - if [ "$CXX" = "g++" ]; then export CXX="g++-5" CC="gcc-5"; fi
+  - if [ "$CXX" = "clang++" ]; then export CXX="clang++-3.7" CC="clang-3.7"; fi
 # - cd ${TRAVIS_BUILD_DIR}
 # - wget http://ftp.de.debian.org/debian/pool/main/l/lcov/lcov_1.11.orig.tar.gz
 # - tar xf lcov_1.11.orig.tar.gz
diff --git a/configure b/configure
index aca8775a..20cad6fd 100755
--- a/configure
+++ b/configure
@@ -32847,10 +32847,8 @@ if test "x$ac_cv_crc32_intrinsics" = xyes; then
 		ULIB_LIBS="$ULIB_LIBS -lgcc_s -lgcc"
  	else
 		to_match='gcc (Ubuntu 5.*'
-
 		case `gcc --version | head -n 1` in
 			$to_match) ULIB_LIBS="$ULIB_LIBS -lgcc_s -lgcc" ;; # On Ubuntu 16.04 bug: [#65612](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65612)
-
 		esac
 	fi
 fi
@@ -36679,7 +36677,7 @@ fi
 
 
 if test -n "$AWK"; then
-  $AWK -f configure_log.awk config.log							> include/ulib/internal/config1.h
+  $AWK -f configure_log.awk config.log							  > include/ulib/internal/config1.h
   $AWK -f configure_h.awk   include/ulib/internal/config.h > include/ulib/internal/config2.h
   cd include/ulib/internal
   cat   config2.h config1.h >> config.h
@@ -36688,7 +36686,6 @@ if test -n "$AWK"; then
 fi
 
 echo
-echo "***"
 
 # Verify the integrity of the current configuration
 if test "$cross_compiling" != "yes"; then
@@ -36725,8 +36722,17 @@ $as_echo "$ac_cv_configuration_is_usable" >&6; }
 
 	if test "$ac_cv_configuration_is_usable" = "no" ; then
 		# It appears that ulib/internal/common.cpp not compiled. If it didn't compile then there would be no chance that the rest would compile.
-		as_fn_error $? "The generated configuration appears to be unusable.
-		Please verify that your system path and environment variables are correct." "$LINENO" 5
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: " >&5
+$as_echo "" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ${T_MD}The generated configuration appears to be unusable. Please verify that your system path and environment variables are correct:${T_ME}" >&5
+$as_echo "${T_MD}The generated configuration appears to be unusable. Please verify that your system path and environment variables are correct:${T_ME}" >&6; }
+
+		echo "***********************************************************************************************************************************"
+		NLINE=`grep -n 'checking if generated configuration is usable' config.log | cut -d':' -f1`
+		CFGLOG=`tail -n +$NLINE config.log`
+		echo "${CFGLOG}"
+		echo "***********************************************************************************************************************************"
 		exit 1
 	fi
 fi
@@ -36735,4 +36741,3 @@ echo
 echo "You are now ready to build ULib"
 echo "Enter the following command: ${T_MD}make && make install${T_ME}"
 echo "After on some environment you must run also the following command: ${T_MD}sudo ldconfig${T_ME}"
-echo "***"
diff --git a/configure.ac b/configure.ac
index c7f72b40..8b6856ac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2540,10 +2540,8 @@ if test "x$ac_cv_crc32_intrinsics" = xyes; then
 		ULIB_LIBS="$ULIB_LIBS -lgcc_s -lgcc"
  	else
 		to_match='gcc (Ubuntu 5.*'
-
 		case `gcc --version | head -n 1` in
 			$to_match) ULIB_LIBS="$ULIB_LIBS -lgcc_s -lgcc" ;; # On Ubuntu 16.04 bug: [#65612](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65612)
-				
 		esac
 	fi
 fi
@@ -2753,7 +2751,7 @@ AC_CONFIG_FILES([
 AC_OUTPUT
 
 if test -n "$AWK"; then
-  $AWK -f configure_log.awk config.log							> include/ulib/internal/config1.h
+  $AWK -f configure_log.awk config.log							  > include/ulib/internal/config1.h
   $AWK -f configure_h.awk   include/ulib/internal/config.h > include/ulib/internal/config2.h
   cd include/ulib/internal
   cat   config2.h config1.h >> config.h
@@ -2762,7 +2760,6 @@ if test -n "$AWK"; then
 fi
 
 echo
-echo "***"
 
 # Verify the integrity of the current configuration
 if test "$cross_compiling" != "yes"; then
@@ -2776,8 +2773,12 @@ if test "$cross_compiling" != "yes"; then
 
 	if test "$ac_cv_configuration_is_usable" = "no" ; then
 		# It appears that ulib/internal/common.cpp not compiled. If it didn't compile then there would be no chance that the rest would compile.
-		AC_MSG_ERROR([The generated configuration appears to be unusable.
-		Please verify that your system path and environment variables are correct.])
+		TWOCAN_CONF_MSG(The generated configuration appears to be unusable. Please verify that your system path and environment variables are correct)
+		echo "***********************************************************************************************************************************"
+		NLINE=`grep -n 'checking if generated configuration is usable' config.log | cut -d':' -f1`
+		CFGLOG=`tail -n +$NLINE config.log`
+		echo "${CFGLOG}"
+		echo "***********************************************************************************************************************************"
 		exit 1
 	fi
 fi
@@ -2786,4 +2787,3 @@ echo
 echo "You are now ready to build ULib"
 echo "Enter the following command: ${T_MD}make && make install${T_ME}"
 echo "After on some environment you must run also the following command: ${T_MD}sudo ldconfig${T_ME}"
-echo "***"