build exceptionhandling-example only if stacktrace is given; refs #7

doc/examples/makefile.am

@@ -4,15 +4,20 @@
 ## 45678901234567890123456789012345678901234567890123456789012345678901234567890
 
 exampledir = ${docdir}/examples
-example_PROGRAMS = exceptionhandling smartpointer arguments
+example_PROGRAMS = smartpointer arguments
+if HAVE_STACKTRACE
+example_PROGRAMS += exceptionhandling
+endif
 example_DATA = ${smartpointer_SOURCES} ${exceptionhandling_SOURCES}	\
                ${arguments_SOURCES}
 
 CPPFLAGS = -I${top_srcdir}/src
 LDFLAGS = -L${top_builddir}/src
 
+if HAVE_STACKTRACE
 exceptionhandling_SOURCES = exceptionhandling.cxx
 exceptionhandling_LDADD = ${top_builddir}/src/.libs/libmrw.la
+endif
 
 smartpointer_SOURCES = smartpointer.cxx
 smartpointer_LDADD = ${top_builddir}/src/.libs/libmrw.la