2 files changed, 7 insertions, 5 deletions

diff --git a/m4/ac_pkg_swig.m4 b/m4/ac_pkg_swig.m4
index 738f69d..97244bc 100644
--- a/m4/ac_pkg_swig.m4
+++ b/m4/ac_pkg_swig.m4
@@ -64,8 +64,8 @@
 AC_DEFUN([AC_PROG_SWIG],[
         AC_PATH_PROG([SWIG],[swig])
         if test -z "$SWIG" ; then
-                AC_MSG_WARN([cannot find 'swig' program. You should look at http://www.swig.org])
-                SWIG='echo "Error: SWIG is not installed. You should look at http://www.swig.org" ; false'
+                AC_MSG_WARN([cannot find 'swig' program. You should look at http://www.swig.org] or install your distribution specific swig package.)
+                SWIG=false
         elif test -n "$1" ; then
                 AC_MSG_CHECKING([for SWIG version])
                 [swig_version=`$SWIG -version 2>&1 | grep 'SWIG Version' | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`]
@@ -107,7 +107,7 @@ AC_DEFUN([AC_PROG_SWIG],[
                                 -o $available_minor -ne $required_minor \
                                 -o $available_patch -lt $required_patch ; then
                                 AC_MSG_WARN([SWIG version >= $1 is required.  You have $swig_version.  You should look at http://www.swig.org])
-                                SWIG='echo "Error: SWIG version >= $1 is required.  You have '"$swig_version"'.  You should look at http://www.swig.org" ; false'
+                                SWIG=false
                         else
                                 AC_MSG_NOTICE([SWIG executable is '$SWIG'])
                                 SWIG_LIB=`$SWIG -swiglib`
@@ -115,7 +115,7 @@ AC_DEFUN([AC_PROG_SWIG],[
                         fi
                 else
                         AC_MSG_WARN([cannot determine SWIG version])
-                        SWIG='echo "Error: Cannot determine SWIG version.  You should look at http://www.swig.org" ; false'
+                        SWIG=false
                 fi
         fi
         AC_SUBST([SWIG_LIB])
diff --git a/m4/ax_swig_enable_cxx.m4 b/m4/ax_swig_enable_cxx.m4
index 722caeb..c1eca8c 100644
--- a/m4/ax_swig_enable_cxx.m4
+++ b/m4/ax_swig_enable_cxx.m4
@@ -47,5 +47,7 @@ AU_ALIAS([SWIG_ENABLE_CXX], [AX_SWIG_ENABLE_CXX])
 AC_DEFUN([AX_SWIG_ENABLE_CXX],[
         AC_REQUIRE([AC_PROG_SWIG])
         AC_REQUIRE([AC_PROG_CXX])
-        SWIG="$SWIG -c++"
+        if test "$SWIG" != "false"; then
+                SWIG="$SWIG -c++"
+        fi
 ])